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python3 -c " import pdfplumber with pdfplumber.open('/home/daytona/workspace/attachments/7221c298-405b-4c36-ac0e-91fa10d6b3fa/DERMATITIS.pdf') as pdf: print(f'Total pages: {len(pdf.pages)}') for i, page in enumerate(pdf.pages): text = page.extract_text() print(f'--- PAGE {i+1} ---') print(text) print() "

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~/dermatitis-notes/DERMATITIS_NOTES.md

# 📚 DERMATITIS – EASY STUDY NOTES
### Source: Habif's Clinical Dermatology (Chapters 3, 4, 5)

---

## ⚡ QUICK MEMORY AID: ECZEMA = ITCHY + INFLAMED SKIN

---

# CHAPTER 3: ECZEMA & HAND DERMATITIS

---

## 🔴 1. THREE STAGES OF ECZEMA

| Stage | Look | Feel | Examples | Treatment |
|-------|------|------|----------|-----------|
| **ACUTE** | Red, swollen, tiny clear vesicles, may blister | Intense itch (even during sleep) | Poison ivy, id reaction, pompholyx | Cool wet compresses, oral/topical steroids, antihistamines, antibiotics |
| **SUBACUTE** | Red + scaling, dry, indistinct borders, "parched" | Slight–moderate itch, burning, stinging | Atopic dermatitis, contact dermatitis, stasis | Topical steroids, lubrication, antihistamines, tar |
| **CHRONIC** | Thick skin, accentuated skin lines (lichenification), "washboard" | Moderate–intense itch | Lichen simplex chronicus, atopic dermatitis, hyperkeratotic eczema | Potent topical steroids + occlusion, intralesional steroids |

> 💡 **Key fact:** Eczema can start at ANY stage and move to another. Secondary infection turns subacute → acute.

---

## 🖐️ 2. HAND ECZEMA

### Types at a Glance

| Type | Key Feature | Location |
|------|------------|----------|
| Irritant contact dermatitis | Most common (35%); dishpan hands | Back of hands, fingers |
| Atopic hand dermatitis | History of childhood eczema | Back of hands |
| Allergic contact dermatitis | Patch test positive; 19% of cases | Varies |
| Pompholyx (dyshidrosis) | Deep-seated vesicles on palms/sides of fingers | Palms, lateral fingers, soles |
| Fingertip eczema | Dry, fissured, no skin lines | Fingertips only |
| Hyperkeratotic eczema | Dense yellow-brown scale, fissures | Palms, mainly in middle-aged men |
| Nummular eczema | Coin-shaped plaques | Back of hands |
| Recurrent focal palmar peeling | Noninflammatory peeling, summer months | Palms/soles |

### 📋 Irritant Contact Dermatitis (Most Common)
- **Mechanism:** Stratum corneum is damaged by repeated irritants → skin barrier breaks down
- **Who gets it:** Mothers with young children, hairdressers, dishwashers, surgeons, dentists, bartenders, industrial workers
- **Progression:** Dryness/chapping → cracks/fissures → red swollen backs of hands → vesicles + oozing → (if caustic chemical) necrosis/ulceration

**Patient Instructions (Box 3.2):**
1. Wash as infrequently as possible
2. Shampoo with rubber gloves
3. Avoid direct contact with cleaners/detergents
4. Wear rubber gloves OVER white cotton gloves

**Treatment:**
- Treat by stage (acute/subacute/chronic)
- Lubrication essential
- Barrier creams (water-repellent or oil-repellent types)

### 🤧 Atopic Hand Dermatitis
- Most common form of adult atopic dermatitis
- Starts as irritant chapping → evolves to eczematous stages
- **Predictors:** Hand dermatitis before age 15, widespread childhood eczema, dry/itchy skin in adult life
- Treatment: Same as irritant hand eczema

### 🧪 Allergic Contact Dermatitis (Hands)
- Common allergens: Nickel (door knobs, scissors, jewelry), rubber, fragrances, formaldehyde, lanolin
- Confirm with **patch testing**
- **Treatment:** Identify and avoid allergen → treat like subacute/chronic eczema

### 💦 Pompholyx (Dyshidrosis)
- **Presentation:** Intense itch → vesicles on palms/sides of fingers → vesicles resolve in 3-4 weeks leaving ring of scale
- **Causes:** Mycosis (10%), allergic contact (67.5%), idiopathic atopic (15%)
- **Note:** Nickel, cobalt, chromium ingestion can trigger it even if patch test negative

**Treatment:**
- Topical steroids + cool wet compresses
- Oral antibiotics if secondary infection
- Short courses of oral steroids for acute flares
- Resistant cases: PUVA therapy, low-dose methotrexate
- Low-metal diet if metal-sensitive

### 🖐️ Fingertip Eczema
- Dry, cracked, fissured fingertips; skin lines disappear
- Chronic, resistant to treatment
- Rule out allergy and psoriasis
- Treatment: Avoid irritants, lubricate frequently; try pimecrolimus, tacrolimus, crisaborole, tar creams

### 🟡 Hyperkeratotic Eczema
- Almost exclusively in men
- Dense yellow-brown scale on palms, like "mud drying in riverbed"
- Treatment: Group II steroid cream + occlusion; patch test if recurrent

### 💰 Nummular Eczema (Coin-shaped)
- Coin-shaped (1–5 cm) red plaques
- Common in middle-aged/elderly
- Back of hands, extensor forearms/legs, flanks, hips
- Chronic, may recur
- **Treatment:** Based on stage – treat as subacute or chronic eczema; tacrolimus 0.1%

---

## 🦵 3. OTHER ECZEMA PRESENTATIONS

### 🏜️ Asteatotic Eczema (Eczema Craquelé)
- **Cause:** Excess drying, especially winter, elderly
- **Look:** "Cracked porcelain" or "crazy paving" pattern – horizontal fissures on lower legs
- **Associations:** Malignancy (lymphoma, leukemia), malnutrition, Sjögren syndrome, CHF, nephrotic syndrome, retinoids

**Treatment:**
- Initial stages: Group III or IV topical steroid ointments (subacute approach)
- Severe: Wet compresses + antibiotics first, then Group V steroids + lubricants
- ⚠️ Avoid oral steroids – disease flares within 1-2 days of stopping

### 🧦 Chapped Fissured Feet (Sweaty Sock Dermatitis)
- **Age:** 7–14 years (mean onset 7.3 yrs; mean remission 14.3 yrs)
- **Cause:** Moist socks inside impermeable shoes → artificial intertrigo
- **Look:** Scaling, erythema, fissuring on toes and soles; worsens in winter
- **DDx:** Psoriasis (darker red, scales shed), tinea pedis (rare in children), allergic contact dermatitis (spares soles)

**Treatment:**
- Group II or III topical steroids twice daily (or with occlusion at bedtime)
- Tacrolimus ointment
- Lubricating creams several times/day
- Prevention: Change into leather shoes at school, change cotton socks 1-2x/day

---

## 😖 4. SELF-INFLICTED DERMATOSES

### Lichen Simplex Chronicus (LSC)
- Created by **habitual scratching** of one localized area
- **Look:** Thick lichenified plaque, accentuated skin lines, "washboard" appearance
- **Sites (order of frequency):** Outer lower leg → scrotum/vulva/anal area → wrists/ankles → upper eyelids → back of neck (lichen simplex nuchae) → ear orifice → extensor forearms → fold behind ear → scalp

**Treatment:**
- Stop scratching (explain this first!)
- Topical steroids (clobetasol for neck/legs/wrists/ankles/vulva)
- Cordran tape (occlusive steroid tape)
- Intralesional triamcinolone acetonide 10 mg/mL
- Intertriginous areas: Only Group V or VI topical steroids needed

### Prurigo Nodularis
- Nodular form of LSC; intractable pruritus
- **Look:** 1-2 cm hard, dome-shaped nodules on extensor arms and legs
- Hyperplasia of cutaneous papillary dermal nerves

**Treatments (Evidence-Based):**
| Drug | Route | Notes |
|------|-------|-------|
| Betamethasone 0.1% | Topical | Use with occlusion; alternate with steroid-sparing agents |
| Calcipotriol 50 mcg/g | Topical | May be more effective than betamethasone |
| Pimecrolimus 1% | Topical | Discuss FDA black-box warning |
| Tacrolimus 0.1% | Topical | Discuss FDA black-box warning |
| Capsaicin 0.025–0.3% | Topical | 4–6x/day; low compliance |
| Fexofenadine + Montelukast | Oral | Higher than standard antihistamine dose |
| Naltrexone | Oral | High relapse rate after stopping |
| Gabapentin | Oral | 900 mg/day; can taper |
| Pregabalin | Oral | 25 mg 3x/day; more effective than antihistamines |
| Intralesional triamcinolone | Injection | Very effective |
| Cryotherapy | Procedure | Sometimes successful |
| Cyclosporine | Oral | Effective in studies |
| Thalidomide / Lenalidomide | Oral | For most recalcitrant cases; requires special registry |

### Neurotic Excoriations
- Patient-induced linear excoriations; mostly aware they create lesions
- **Psychiatric comorbidities:** OCD, perfectionistic traits, depression, anxiety
- **Look:** Few to hundreds of excoriations in easily reached areas (face most common); groups of white scars with hyperpigmentation

**Treatment:**
- Group I topical steroids twice daily OR Group V under plastic wrap occlusion
- Systemic antibiotics
- Intralesional triamcinolone 10 mg/mL for resistant lesions
- SSRIs/SSNRIs/TCAs for depression
- Empathic, supportive approach (better than insight-oriented psychotherapy)

### Psychogenic Parasitosis (Delusional Infestation)
- Patient convinced skin is infested with organisms despite no evidence
- **"Matchbox sign":** Patients bring skin debris in matchboxes as "proof"
- Mostly females, disabled/retired, long history

**Management:**
- Rule out true infestation (scabies, mites)
- Supportive, non-confrontational approach
- If belief is shakable → offer benzodiazepine + suggest psychiatric referral
- If belief is unshakable (delusional) → antipsychotics:
  - **Pimozide (Orap)**
  - **Risperidone (Risperdal)**
  - **Olanzapine (Zyprexa)**
  - **Quetiapine (Seroquel)**

---

## 🦵 5. STASIS DERMATITIS & VENOUS ULCERS

### Stasis Dermatitis
- **Cause:** Venous insufficiency → increased hydrostatic pressure → eczematous eruption on lower legs

**Stages:**
- **Subacute:** Winter onset; dry, scaly; brown hemosiderin staining
- **Acute:** Sudden red itchy plaque; may have weeping/crusts; id reaction possible
- **Chronic:** Recurrent; cyanotic red plaque over medial malleolus; fibrosis; cobblestone skin; permanent dark brown hyperpigmentation

**Treatment of Stasis Dermatitis:**
- **Subacute/early:** Group II–V topical steroid creams/ointments + lubricating creams
- **Acute/wet/infected:** Cool wet Burow's solution compresses (30-60 min several times/day) + oral antibiotics (anti-Staph: cephalexin) + Group III–V topical steroids
- **Allergy warning:** Avoid neomycin, parabens, lanolin in topical products (high sensitization risk)
- **⚠️ Important:** Never apply steroid creams directly onto ulcer (stops healing)
- Elevate legs

### Venous Leg Ulcers

**3 Types Compared:**

| Feature | Venous | Arterial | Neuropathic |
|---------|--------|----------|-------------|
| Location | Medial malleolus | Distal, bony prominences | Pressure points on feet |
| Appearance | Shallow, irregular borders | Punched-out, well-demarcated | Callus surrounding, undermined edges |
| Pain | Dull, improves with elevation | Severe, does NOT improve with elevation | Numbness/burning |
| Exam | Varicose veins, edema, dermatitis | Absent pulses, shiny skin, no hair | No sensation to monofilament |
| ABI | >0.9 | <0.7 | Normal |
| Risk factors | DVT, obesity, leg injury | Diabetes, hypertension, smoking | Diabetes, leprosy |

**Treatment of Venous Ulcers (Summary):**
1. **Reduce venous pressure:** Bed rest, leg elevation, compression bandages
2. **Control inflammation:** Wet compresses + topical steroids
3. **Infection/bacterial contamination:** Systemic antibiotics + topical antibiotics (Iodoflex pad, Iodosorb gel)
4. **Debride:** Enzyme-debriding agents, surgical/mechanical debridement
5. **Dressings:** Occlusive dressings promote healing
6. **Compression:** Cornerstone of therapy
   - ABI 0.8–1.2: High compression
   - ABI 0.5–0.8: Modified compression (≤20 mmHg)
   - ABI <0.5: No compression
7. **Adjuncts:** Pentoxifylline (400–800 mg 3x/day), doxycycline (antiinflammatory), vitamins C/E + zinc, low-molecular-weight heparin

**Compression Stockings:**
| Class | Pressure (mmHg) | Indication |
|-------|-----------------|-----------|
| I | 20-30 | Mild edema, varicose veins |
| II | 30-40 | Moderate edema/venous disease |
| III | 40-50 | Severe edema/ulcers/lymphedema |
| IV | 50-60 | Lymphedema |

---

# CHAPTER 4: CONTACT DERMATITIS & PATCH TESTING

---

## ⚖️ 6. IRRITANT VS. ALLERGIC CONTACT DERMATITIS

| Feature | Irritant | Allergic |
|---------|---------|---------|
| Who gets it? | Everyone | Only genetically predisposed |
| Mechanism | Nonimmunologic (physical/chemical damage) | Type IV delayed hypersensitivity (T-cell mediated) |
| Exposures needed | Few to many | One or several to sensitize, then rapid on re-exposure |
| Substance type | Organic solvents, alkaline soaps | Low-molecular-weight haptens (metals, formalin) |
| Onset | Gradual | Rapid (12–48 h after re-exposure) |
| Distribution | Confined to contact area | May spread beyond contact area |
| Diagnosis | Trial of avoidance | Patch testing |
| Management | Protection + reduce exposure | Complete avoidance |

---

## 🌿 7. RHUS (POISON IVY/OAK/SUMAC) DERMATITIS

- Most common cause of allergic contact dermatitis in the USA
- **Allergen:** Urushiol (mixture of catechols)
- **Key sign:** Linear vesicular eruption (plant dragged across skin)
- Blister fluid does **NOT** spread the reaction
- Cross-reacts with: Cashew nut, mango, Japanese lacquer tree, ginkgo

**Prevention:**
- Wash skin with ANY soap immediately after exposure
- Washing within 10 min: removes all urushiol
- After 30 min: only 50% removed; after 60 min: none removed
- IvyBlock (5% quaternium-18 bentonite lotion): prevents in >50% of cases

**Treatment:**
- **Mild:** Cool wet compresses, topical steroids (Group I–V), calamine, hydroxyzine
- **Severe:** Prednisone (Table 4.5):
  - Days 1-4: 60 mg/day
  - Taper over 14 days total
  - Alternative: 20 mg twice daily for at least 7 days
  - DO NOT use steroid dose packs (inadequate amount)
  - Alternative: Triamcinolone acetonide 40 mg IM for non-compliant patients

---

## 🧤 8. NATURAL RUBBER LATEX ALLERGY

**Three Types:**
| Type | Mechanism | Presentation |
|------|-----------|-------------|
| **Irritant contact** | Nonimmune; heat/friction | Eczema under gloves |
| **Type IV allergic** | T-cell mediated; rubber accelerators (thiurams 72%, carbamates 25%) | Eczema at contact site |
| **Type I (immediate)** | IgE-mediated; latex proteins | Urticaria, anaphylaxis, asthma, death |

**High-risk groups:** Healthcare workers, rubber industry workers, multiple surgery patients

**Type I Diagnosis:** RAST test first; if negative, use test/skin-prick test with life support available

**Treatment:**
- Type IV: Identify allergen by patch testing → alternative rubber articles
- Type I: Nonlatex gloves; latex-safe hospital environment
- Surgeons: Elastyren or Tactylon hypoallergenic gloves

---

## 👟 9. SHOE ALLERGY

- **Look:** Subacute eczema over dorsa of feet (spares interdigital spaces – unlike tinea pedis)
- **Common allergens:** Rubber/mercaptobenzothiazole (#1), chromate, p-tert-butylphenol formaldehyde resin
- **Diagnosis:** Patch test (standard series + shoe material)
- **Treatment:** Control perspiration (Drysol 20% aluminum chloride), change socks daily, barrier insoles; most vinyl shoes safe

---

## 🔩 10. METAL DERMATITIS

### Nickel
- **#1 cause** of allergic contact dermatitis worldwide; more common in women
- **Sources:** Jewelry, jean buttons/zippers, watchbands, scissors, door handles, coined money (cashiers)
- **Classic sites:** Ears (ear piercing), wrist (watchband), abdomen (belt buckle)

**Low-Nickel Diet:** (for pompholyx or hand eczema in nickel-sensitive patients)
- **Avoid (high nickel):** Dark chocolate, cocoa, nuts, legumes, oatmeal, soy, mussels, shellfish
- **Allowed:** Meat, poultry, eggs, milk, dairy, rice (polished), most vegetables, fresh fruits
- **Baboon Syndrome:** Systemic nickel exposure → symmetric eczema on elbows, axillae, eyelids, neck + bright red anogenital area

### Chromates
- Common sensitizer in men in industrialized countries
- Sources: **Cement** (most common), leather gloves, photographic processes, dyes
- Cement also acts as **irritant** (alkali burns, pH 12)

---

## 🔬 11. PATCH TESTING

**When to use:** Persistent eczema unresponsive to treatment, recurring eczema, unusual eczema

**T.R.U.E. TEST** – 36 standard allergens:
- Read at 48 hours, then again at 3–7 days (delayed reactions common with neomycin)

**Grading:**
- `+` = Weak positive: erythema, infiltration, papules
- `++` = Strong positive: edema or vesicles
- `+++` = Extreme: spreading, bullous, ulcerative
- `IR` = Irritant reaction (NOT a positive allergy test)

**Top 15 Allergens (North American Contact Dermatitis Group):**
Nickel sulfate → Fragrance mix → Methylisothiazolinone → Neomycin → Bacitracin → Cobalt → Myroxylon pereirae → p-Phenylenediamine → Formaldehyde → MCI/MI

**⚠️ When NOT to patch test:**
- Active flaring dermatitis >25% BSA ("angry back" / excited skin syndrome)
- Recent systemic steroids (wait 2 weeks)
- After PUVA or UV therapy

---

# CHAPTER 5: ATOPIC DERMATITIS (AD)

---

## 🧬 12. ATOPIC DERMATITIS – OVERVIEW

- **Chronic, pruritic, relapsing** inflammatory skin disease
- Most common in children; affects 15-25% of children, 7.2% of adults
- **Triad:** Eczema + elevated IgE + personal/family history of allergic rhinitis, asthma
- **Genetics:** Polygenic; 77% concordance in monozygotic twins vs 15% in dizygotic
- **Key pathology:** Filaggrin (FLG) gene mutation → decreased skin barrier → Staphylococcus aureus colonization → TH-2 immune response dominance

**Intrinsic vs. Extrinsic:**
| | Intrinsic | Extrinsic |
|--|-----------|-----------|
| IgE | Normal | Elevated |
| Filaggrin mutation | No | Yes |
| Onset | Adult | Early childhood |
| Immune response | TH-17/TH-22 | TH-2 dominant |

---

## 👶 13. CLINICAL PHASES OF AD

### Infant Phase (Birth – 2 Years)
- Starts around **3rd month** of life
- **Face:** Red, scaling plaques on cheeks, spares perioral/paranasal areas
- Chin may be worse (drooling)
- Habitual lip licking → perioral eczema
- Diaper area is often **SPARED**
- Scalp involvement can resemble seborrheic dermatitis

### Childhood Phase (2 – 12 Years)
- **Flexural areas:** Antecubital/popliteal fossae, neck, wrists, ankles
- Perspiration → burning + itching → itch-scratch cycle
- Lichenification develops
- May develop hypopigmented areas from melanocyte destruction

### Adult Phase (12 Years → Adult)
- Localized inflammation with lichenification
- **Common patterns:**
  - Flexural inflammation
  - Hand dermatitis (most common adult expression)
  - Eyelid inflammation
  - Lichenification of anogenital area (vulva, scrotum, anus)

---

## 🔍 14. DIAGNOSTIC FEATURES OF AD (Box 5.1)

**Essential (must be present):**
- Pruritus
- Eczema (age-appropriate pattern: flexural in older patients, facial/extensor in infants)

**Important supporting features:**
- Early age of onset
- Atopy (personal or family history)
- IgE reactivity
- Xerosis (dry skin)

**Exclude:** Scabies, seborrheic dermatitis, contact dermatitis, ichthyosis, psoriasis, cutaneous T-cell lymphoma

---

## 🔥 15. TRIGGERING FACTORS FOR AD

| Trigger | Mechanism |
|---------|-----------|
| Temperature changes/sweating | Sweating induces itching in fossae |
| Low humidity (winter) | Skin loses moisture → dry, fragile, itchy |
| Excessive washing | Removes skin lipids and water-binding chemicals |
| Wool, chemicals, cosmetics, detergents | Direct irritation |
| Staphylococcus aureus | Colonizes lesional skin; worsens inflammation |
| House dust mites | Most important aeroallergen |
| Foods (infants) | Eggs, milk, peanuts, soy, wheat – exacerbate in children |
| Emotional stress | Can trigger sudden widespread flare |

---

## 🌟 16. ASSOCIATED FEATURES OF AD

| Feature | Description |
|---------|-------------|
| **Xerosis (dry skin)** | Most common; itchy; worse in winter; avoid frequent washing |
| **Ichthyosis vulgaris** | Dry rectangular white scales on extensor arms/legs; treat with 12% ammonium lactate or urea cream |
| **Keratosis pilaris** | Small rough follicular papules on posterolateral upper arms and anterior thighs; treat with ammonium lactate, urea, or salicylic acid |
| **Hyperlinear palmar creases** | Accentuated palm lines; moisturizers don't improve it |
| **Pityriasis alba** | Hypopigmented round patches on face/arms; resolve with time; try tacrolimus 0.1% |
| **Dennie-Morgan fold** | Extra line under lower eyelid (unreliable sign) |
| **Cataracts** | 1–25% prevalence in AD; monitor with chronic steroid use |

---

## 💊 17. TREATMENT OF ATOPIC DERMATITIS

### Step 1: Dry Skin Control
- Daily bath (apply moisturizer **within 3 minutes** of bath = "soak and smear")
- Use unscented petrolatum or cream (better than lotion)
- Avoid frequent washing and drying soaps
- Humidify home in winter (>50% humidity)

### Step 2: Topical Anti-Inflammatory Therapy

**A. Topical Corticosteroids (TCS)** – First-line
- Apply for **2 weeks**, then rest 1 week, then restart
- Use **mid-to-high strength** initially for rapid control; don't use weak steroids (hydrocortisone) as initial therapy – inflammation persists
- **Face/eyelids:** Use weak steroids (desonide) or tacrolimus/pimecrolimus
- **Lichenified plaques:** Group I–II steroids under occlusion for 10-14 days
- **Maintenance:** Fluticasone once daily on weekends to prevent relapse

**B. Topical Calcineurin Inhibitors (TCIs) – Steroid-sparing**
| Drug | Strength | Age | Indication |
|------|----------|-----|-----------|
| Pimecrolimus (Elidel) 1% cream | Mild | ≥2 years | Mild-moderate AD; steroid-sparing |
| Tacrolimus (Protopic) 0.03% ointment | Moderate | ≥2 years | Moderate-severe AD |
| Tacrolimus (Protopic) 0.1% ointment | Stronger | Adults | Moderate-severe AD |

- Apply **twice daily**
- Safe on **face and eyelids** (no atrophy)
- **Side effect:** Burning/stinging (resolves in few days)
- ⚠️ FDA black-box warning: Avoid prolonged continuous use; avoid excessive UV exposure

**C. Crisaborole (Eucrisa) 2% ointment** – PDE-4 inhibitor
- Mild-moderate AD in patients **≥2 years**
- Twice daily
- **Side effect:** Pain at application site (co-administer with Group V/VI steroid to help)

### Step 3: Treat Infection

**Bleach Baths:**
- ¼ to ½ cup bleach in full bathtub
- Daily or weekly; reduces Staph colonization

**Antibiotics (for clinical infection):**
- Cephalexin (Keflex) or Cefadroxil
- Start oral antibiotics **2 days BEFORE** topical steroids

**Intranasal mupirocin:** Reduce recurrent Staph infections

### Step 4: Control Itching

**Antihistamines:**
- Hydroxyzine – sedating; helps sleep
- Doxepin HCl cream 5% (Zonalon) – topical antipruritic; causes drowsiness in >20%
- ⚠️ Nonsedating antihistamines have LIMITED evidence for AD

### Step 5: Phototherapy
- Combined UVA–UVB, narrowband UVB (311 nm), UVA1, PUVA
- Effective for mild/moderate/severe AD
- PUVA avoided by many due to long-term carcinogenicity risk

### Step 6: Systemic Therapy (Severe, Refractory AD)

| Drug | Mechanism | Notes |
|------|-----------|-------|
| **Cyclosporine** | Inhibits T cells | Most commonly used; effective in children and adults; short-term preferred; max 5 mg/kg/day |
| **Methotrexate** | Inhibits folic acid/DNA synthesis | Weekly dosing; give folic acid supplementation |
| **Azathioprine** | Purine analog; T and B cell suppression | Check thiopurine methyltransferase (TPMT) level first |
| **Mycophenolate mofetil** | Impairs purine synthesis | Effective with no serious adverse effects |
| **Oral corticosteroids** | Antiinflammatory | Only for severe unresponsive AD as bridge therapy; high relapse rate |

**Dupilumab (Dupixent)** – Biologic (IL-4/IL-13 blocker)
- Human monoclonal antibody (IgG4)
- Binds IL-4Rα → blocks IL-4 and IL-13
- For **moderate-to-severe AD** failing topical therapy
- Subcutaneous injection
- **Side effect:** Conjunctivitis (~16%); refer to ophthalmology if persistent
- Avoid live vaccines while on dupilumab

### Step 7: Hospitalization (Severely Resistant Cases)
- Short stay with intensive topical therapy + wet dressings
- Mean treatment time: 3.6 days
- Home hospitalization protocol: Vinyl suit occlusion 2–8 hours, bleach/antibacterial baths, cotton bedclothes, temp 68–70°F, humidity 70%, systemic antibiotics + sedating antihistamines

---

## 🥚 18. FOOD ALLERGY IN ATOPIC DERMATITIS

**Common offenders in children:** Eggs (#1), milk, peanuts, soy, wheat
**Common in adults:** Shellfish, fish, peanuts, tree nuts

**Key rules:**
- Testing recommended for infants/young children with **moderate-to-severe AD**
- Food elimination diet (4–6 weeks) may be tried if specific allergen suspected
- Do NOT do broad food elimination based solely on positive IgE (low specificity)
- Oral food challenge = **gold standard** for confirming food allergy
- Early peanut introduction in infants with severe eczema **reduces** peanut allergy risk

---

## 📊 QUICK COMPARISON: ECZEMA SUBTYPES

| Condition | Key Trigger | Classic Location | Treatment Pearl |
|-----------|------------|-----------------|-----------------|
| Irritant contact dermatitis | Repeated chemical/water exposure | Hands | Barrier protection + moisturizers |
| Allergic contact dermatitis | Sensitizing allergen (nickel, rubber, fragrances) | Corresponds to allergen contact | Identify + avoid allergen; patch test |
| Atopic dermatitis | Genetic; multiple triggers | Flexures in children; hands in adults | Moisturizers + topical steroids/TCIs |
| Stasis dermatitis | Venous insufficiency | Medial lower legs | Compression + topical steroids |
| Nummular eczema | Unknown | Coin-shaped on extremities/trunk | Treat as subacute/chronic eczema |
| Pompholyx | Unknown; nickel/cobalt in some | Palms and sides of fingers | Topical steroids; PUVA for resistant cases |
| Lichen simplex chronicus | Habitual scratching | Neck, genitals, lower legs | Stop scratching + potent topical steroids |
| Asteatotic eczema (eczema craquelé) | Dry skin (winter/elderly) | Anterolateral lower legs | Topical steroids + emollients; NO oral steroids |

---

## 🧠 MEMORY TRICKS

1. **ATOPIC TRIAD = Eczema + Asthma + Allergic Rhinitis** (remember: EAR)
2. **Stages of eczema:** AVS → Acute = Vesicles; Subacute = Scaly red; Chronic = thickened/lichenified
3. **Pompholyx cause:** 67.5% allergic (cosmetics + metals) → test with patch testing and metals diet
4. **Poison ivy treatment:** Wash immediately (10 min → 0% left on skin), prednisone for severe; NO steroid dose packs
5. **Venous ulcer rule:** COMPRESSION is cornerstone; check ABI first
6. **Patch test:** Read at 48 hours AND again at 3–7 days (neomycin often delayed)
7. **Dupilumab:** Blocks IL-4 and IL-13; watch for conjunctivitis

---

## ⚠️ HIGH-YIELD CLINICAL PEARLS

1. Topical steroid creams should NOT be applied **directly onto ulcers** – stops healing
2. Wet compresses in eczema: Use for **max 1–2 days** in asteatotic eczema; prolonged use → excessive drying
3. Commercialized steroid dose packs (Medrol Dosepak) are **inadequate** for poison ivy or severe AD – avoid them
4. In hand eczema, **patch testing** should always be considered even if pattern looks irritant
5. **Adult-onset recalcitrant eczema** may be cutaneous T-cell lymphoma – investigate if no clear cause
6. Tacrolimus is safe on **face and around eyes** (unlike topical steroids – no atrophy risk)
7. In stasis dermatitis, **avoid neomycin, parabens, lanolin** – high sensitization risk in venous skin
8. Generalized eczema in adults may be sign of **Hodgkin lymphoma** (associated with intractable pruritus)
9. Bleach baths are effective at reducing **Staphylococcus aureus** in atopic dermatitis
10. Filaggrin mutations → weak skin barrier → Staph colonization → worsened atopic dermatitis

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*Notes compiled from: Habif's Clinical Dermatology, Chapters 3 (Eczema & Hand Dermatitis), 4 (Contact Dermatitis & Patch Testing), and 5 (Atopic Dermatitis)*

Running Command

cd /home/daytona/workspace/dermatitis-notes && python3 -c " from reportlab.lib.pagesizes import A4 from reportlab.lib.styles import getSampleStyleSheet, ParagraphStyle from reportlab.lib.units import cm from reportlab.lib import colors from reportlab.platypus import SimpleDocTemplate, Paragraph, Spacer, Table, TableStyle, HRFlowable, PageBreak from reportlab.lib.enums import TA_CENTER, TA_LEFT, TA_JUSTIFY import re # Read the markdown file with open('DERMATITIS_NOTES.md', 'r') as f: content = f.read() print('File read successfully, length:', len(content)) print('Starting PDF generation...') "

Running Command

cd /home/daytona/workspace/dermatitis-notes && python3 << 'PYEOF' from reportlab.lib.pagesizes import A4 from reportlab.lib.styles import getSampleStyleSheet, ParagraphStyle from reportlab.lib.units import cm from reportlab.lib import colors from reportlab.platypus import SimpleDocTemplate, Paragraph, Spacer, Table, TableStyle, HRFlowable, PageBreak, KeepTogether from reportlab.lib.enums import TA_CENTER, TA_LEFT import re doc = SimpleDocTemplate( 'DERMATITIS_STUDY_NOTES.pdf', pagesize=A4, rightMargin=1.8*cm, leftMargin=1.8*cm, topMargin=2*cm, bottomMargin=2*cm ) styles = getSampleStyleSheet() # Custom styles title_style = ParagraphStyle('CustomTitle', parent=styles['Title'], fontSize=20, spaceAfter=8, textColor=colors.HexColor('#1a237e'), alignment=TA_CENTER) subtitle_style = ParagraphStyle('Subtitle', parent=styles['Normal'], fontSize=11, spaceAfter=12, textColor=colors.HexColor('#455a64'), alignment=TA_CENTER, italic=True) h1_style = ParagraphStyle('H1', parent=styles['Heading1'], fontSize=15, spaceBefore=14, spaceAfter=6, textColor=colors.white, backColor=colors.HexColor('#1a237e'), borderPad=6, leftIndent=-5, rightIndent=-5, leading=20) h2_style = ParagraphStyle('H2', parent=styles['Heading2'], fontSize=13, spaceBefore=10, spaceAfter=5, textColor=colors.white, backColor=colors.HexColor('#283593'), borderPad=5, leftIndent=-3, rightIndent=-3) h3_style = ParagraphStyle('H3', parent=styles['Heading3'], fontSize=11, spaceBefore=8, spaceAfter=4, textColor=colors.HexColor('#1a237e'), leftIndent=0) body_style = ParagraphStyle('Body', parent=styles['Normal'], fontSize=9, spaceAfter=4, leading=14) bullet_style = ParagraphStyle('Bullet', parent=styles['Normal'], fontSize=9, spaceAfter=3, leftIndent=14, leading=13, bulletIndent=4) bold_style = ParagraphStyle('Bold', parent=styles['Normal'], fontSize=9.5, spaceAfter=3, leading=13, textColor=colors.HexColor('#b71c1c')) note_style = ParagraphStyle('Note', parent=styles['Normal'], fontSize=8.5, spaceAfter=4, leading=12, backColor=colors.HexColor('#fff9c4'), borderPad=5, leftIndent=5, textColor=colors.HexColor('#5d4037')) warning_style = ParagraphStyle('Warning', parent=styles['Normal'], fontSize=8.5, spaceAfter=4, leading=12, backColor=colors.HexColor('#ffccbc'), borderPad=5, leftIndent=5, textColor=colors.HexColor('#bf360c')) story = [] def make_table(headers, rows, col_widths=None): data = [headers] + rows if col_widths is None: page_w = A4[0] - 3.6*cm col_widths = [page_w/len(headers)]*len(headers) t = Table(data, colWidths=col_widths, repeatRows=1) style = TableStyle([ ('BACKGROUND', (0,0), (-1,0), colors.HexColor('#1a237e')), ('TEXTCOLOR', (0,0), (-1,0), colors.white), ('FONTNAME', (0,0), (-1,0), 'Helvetica-Bold'), ('FONTSIZE', (0,0), (-1,0), 8), ('FONTSIZE', (0,1), (-1,-1), 7.5), ('BACKGROUND', (0,1), (-1,-1), colors.HexColor('#f5f5f5')), ('ROWBACKGROUNDS', (0,1), (-1,-1), [colors.white, colors.HexColor('#e8eaf6')]), ('ALIGN', (0,0), (-1,-1), 'LEFT'), ('VALIGN', (0,0), (-1,-1), 'TOP'), ('GRID', (0,0), (-1,-1), 0.5, colors.HexColor('#9fa8da')), ('FONTNAME', (0,1), (-1,-1), 'Helvetica'), ('PADDING', (0,0), (-1,-1), 4), ('WORDWRAP', (0,0), (-1,-1), True), ]) t.setStyle(style) return t # ========== TITLE PAGE ========== story.append(Spacer(1, 1.5*cm)) story.append(Paragraph("📚 DERMATITIS STUDY NOTES", title_style)) story.append(Paragraph("Easy-to-Learn Clinical Notes | Habif's Clinical Dermatology", subtitle_style)) story.append(Paragraph("Chapters 3 (Eczema & Hand Dermatitis) · 4 (Contact Dermatitis) · 5 (Atopic Dermatitis)", subtitle_style)) story.append(HRFlowable(width="100%", thickness=2, color=colors.HexColor('#1a237e'), spaceAfter=12)) story.append(Spacer(1, 0.3*cm)) # Quick memory aid box mem_data = [['⚡ QUICK MEMORY AID: ECZEMA = ITCHY + INFLAMED SKIN\n• Acute = Vesicles + intense itch\n• Subacute = Scaling + redness\n• Chronic = Lichenification (thickened "washboard" skin)\n\nAtopic Triad: EAR = Eczema + Asthma + Rhinitis']] mem_t = Table(mem_data, colWidths=[doc.width]) mem_t.setStyle(TableStyle([ ('BACKGROUND', (0,0), (-1,-1), colors.HexColor('#e8f5e9')), ('FONTNAME', (0,0), (-1,-1), 'Helvetica'), ('FONTSIZE', (0,0), (-1,-1), 9), ('TEXTCOLOR', (0,0), (-1,-1), colors.HexColor('#1b5e20')), ('PADDING', (0,0), (-1,-1), 10), ('BOX', (0,0), (-1,-1), 1.5, colors.HexColor('#2e7d32')), ])) story.append(mem_t) story.append(Spacer(1, 0.5*cm)) # ========== CHAPTER 3 ========== story.append(Paragraph("CHAPTER 3: ECZEMA & HAND DERMATITIS", h1_style)) story.append(Spacer(1, 0.2*cm)) # Section 1: Three stages story.append(Paragraph("1. THREE STAGES OF ECZEMA", h2_style)) story.append(Spacer(1, 0.1*cm)) headers = ['Stage', 'Appearance', 'Symptoms', 'Examples', 'Treatment'] rows = [ ['ACUTE', 'Red, swollen, tiny clear vesicles, may blister or ooze', 'Intense itch (even during sleep)', 'Poison ivy, id reaction, pompholyx, acute nummular', 'Cool wet compresses, oral/topical steroids, antihistamines, antibiotics'], ['SUBACUTE', 'Red + scaling, dry, indistinct borders, "parched appearance"', 'Slight–moderate itch, burning, stinging', 'Atopic dermatitis, contact dermatitis, stasis dermatitis', 'Topical steroids, lubrication, antihistamines, tar; stop wet dressings'], ['CHRONIC', 'Thick skin, accentuated lines = "lichenification" / washboard', 'Moderate–intense itch', 'Lichen simplex chronicus, atopic dermatitis, hyperkeratotic eczema', 'Potent topical steroids + occlusion, intralesional steroids, antihistamines'], ] col_w = [2.0*cm, 3.5*cm, 3.0*cm, 3.5*cm, 3.7*cm] story.append(make_table(headers, rows, col_w)) tip_data = [['💡 KEY POINT: Eczema can start at ANY stage and progress. Secondary infection converts subacute → acute. Habitual scratching converts subacute → chronic.']] tip_t = Table(tip_data, colWidths=[doc.width]) tip_t.setStyle(TableStyle([ ('BACKGROUND', (0,0), (-1,-1), colors.HexColor('#fff9c4')), ('FONTNAME', (0,0), (-1,-1), 'Helvetica-Oblique'), ('FONTSIZE', (0,0), (-1,-1), 8.5), ('TEXTCOLOR', (0,0), (-1,-1), colors.HexColor('#5d4037')), ('PADDING', (0,0), (-1,-1), 7), ('BOX', (0,0), (-1,-1), 1, colors.HexColor('#f9a825')), ])) story.append(Spacer(1, 0.2*cm)) story.append(tip_t) story.append(Spacer(1, 0.4*cm)) # Section 2: Hand Eczema Types story.append(Paragraph("2. HAND ECZEMA – TYPES AT A GLANCE", h2_style)) headers2 = ['Type', '% of Hand Eczema', 'Key Feature', 'Treatment'] rows2 = [ ['Irritant Contact Dermatitis', '35% (Most common)', 'Dishpan hands; dishwashers, hairdressers, mothers', 'Barrier protection, moisturizers, avoid irritants; treat by stage'], ['Atopic Hand Dermatitis', '22%', 'History of childhood eczema; back of hands', 'Same as irritant; avoid irritants + lubricate'], ['Allergic Contact Dermatitis', '19%', 'Patch test positive; nickel, rubber, fragrances', 'Identify + avoid allergen; patch test'], ['Pompholyx (Dyshidrosis)', 'Varies', 'Deep vesicles on palms/sides of fingers; soles', 'Topical steroids; PUVA for resistant cases; low-metal diet'], ['Fingertip Eczema', 'Varies', 'Dry, fissured; skin lines disappear', 'Avoid irritants; lubricate; tacrolimus, pimecrolimus'], ['Hyperkeratotic Eczema', 'Mainly men', 'Dense yellow-brown scale, deep cracks on palms', 'Group II steroid + occlusion; patch test if recurrent'], ['Nummular Eczema', 'Varies', 'Coin-shaped 1–5 cm plaques; back of hands', 'Treat as subacute or chronic eczema; tacrolimus 0.1%'], ['Recurrent Palmar Peeling', 'Common summer', 'Non-inflammatory peeling; palms/soles; asymptomatic', 'Lubrication only; resolves in 1–3 weeks'], ] col_w2 = [3.2*cm, 2.3*cm, 4.0*cm, 4.2*cm] story.append(make_table(headers2, rows2, col_w2)) story.append(Spacer(1, 0.3*cm)) # Pompholyx box story.append(Paragraph("POMPHOLYX (DYSHIDROSIS) – Detailed Treatment", h3_style)) pomp_items = [ "• Topical steroids + cool wet compresses (first-line)", "• Oral antibiotics if secondary infection", "• Short courses of oral steroids for acute flares", "• PUVA therapy for resistant cases", "• Low-dose methotrexate (15–22.5 mg/week) for debilitating cases", "• Oxybutynin (anticholinergic) may provide relief", "• Low-nickel diet if nickel/cobalt/chromium sensitive (64% improve)", ] for item in pomp_items: story.append(Paragraph(item, bullet_style)) story.append(Spacer(1, 0.3*cm)) # Section 3: Other eczema story.append(Paragraph("3. OTHER ECZEMA PRESENTATIONS", h2_style)) story.append(Paragraph("Asteatotic Eczema (Eczema Craquelé)", h3_style)) story.append(Paragraph("Look: 'Cracked porcelain' pattern on lower legs; horizontal fissures; common in elderly/winter", body_style)) story.append(Paragraph("⚠️ Associated with: Malignancy (lymphoma/leukemia), malnutrition, Sjögren syndrome, CHF, nephrotic syndrome, retinoids", warning_style)) story.append(Paragraph("Treatment: Group III/IV topical steroid ointments; if severe → wet compresses + antibiotics first, then Group V steroids + lubricants; DO NOT use oral steroids (disease flares within 1–2 days of stopping)", note_style)) story.append(Spacer(1, 0.2*cm)) story.append(Paragraph("Chapped Fissured Feet (Sweaty Sock Dermatitis)", h3_style)) story.append(Paragraph("Age: 7–14 years. Cause: Moist socks inside impermeable shoes. Worsens in winter, clears in spring.", body_style)) story.append(Paragraph("Treatment: Group II/III topical steroids ± occlusion at bedtime; tacrolimus ointment; lubricating creams after removing socks; change cotton socks 1–2x/day", body_style)) story.append(Spacer(1, 0.3*cm)) # Section 4: Self-inflicted story.append(Paragraph("4. SELF-INFLICTED DERMATOSES", h2_style)) headers3 = ['Condition', 'Key Features', 'Psychiatric Associations', 'Treatment'] rows3 = [ ['Lichen Simplex Chronicus', 'Habitual scratching → thick lichenified plaque; single localized area; common sites: outer lower leg, scrotum, vulva, anus, neck, wrists', 'No known psychopathology; triggered by stress', 'Stop scratching; topical steroids (clobetasol for most areas; Group V/VI for intertriginous); intralesional triamcinolone; Cordran tape'], ['Prurigo Nodularis', '1–2 cm hard nodules on extensor arms/legs; intractable pruritus; neural hyperplasia', 'Pruritus interferes with life/sleep', 'Intralesional steroids; calcipotriol; capsaicin; fexofenadine + montelukast; naltrexone; gabapentin; pregabalin; cryotherapy; cyclosporine'], ['Neurotic Excoriations', 'Linear excoriations in easily reached areas; white scars + hyperpigmentation; patient admits self-inflicted', 'OCD, perfectionistic traits, depression, anxiety', 'Topical steroids; empathic supportive approach; SSRIs/SSNRIs; intralesional triamcinolone for resistant'], ['Psychogenic Parasitosis', 'Convinced of infestation; "matchbox sign"; focal erosions on accessible skin', 'Delusional disorder; mostly women >50', 'Rule out true infestation; supportive; antipsychotics (pimozide, risperidone, olanzapine, quetiapine)'], ] col_w3 = [3.0*cm, 4.2*cm, 3.0*cm, 3.5*cm] story.append(make_table(headers3, rows3, col_w3)) story.append(Spacer(1, 0.3*cm)) # Prurigo nodularis drug table story.append(Paragraph("PRURIGO NODULARIS – Evidence-Based Drug Table", h3_style)) headers_pn = ['Drug', 'Class', 'Clinical Notes'] rows_pn = [ ['Betamethasone 0.1%', 'Topical steroid', 'Twice daily under occlusion; alternate with steroid-sparing agents'], ['Calcipotriol 50 mcg/g', 'Vitamin D analog', 'Twice daily; may be more efficacious than betamethasone'], ['Pimecrolimus 1%', 'TCI (topical)', 'Twice daily; discuss FDA black-box warning'], ['Tacrolimus 0.1%', 'TCI (topical)', 'Twice daily; discuss FDA black-box warning'], ['Capsaicin 0.025–0.3%', 'Topical analgesic', '4–6x/day; low compliance; gradual healing'], ['Fexofenadine + Montelukast', 'Oral antihistamine + leukotriene antagonist', 'Twice daily; reduces pruritus'], ['Naltrexone 50 mg/day', 'Oral opioid antagonist', '41% exacerbation rate after stopping'], ['Gabapentin 900 mg/day', 'Oral neuropathic agent', 'Taper to 300–600 mg maintenance; 3–4 month course'], ['Pregabalin 25 mg 3x/day', 'Oral neuropathic agent', 'More efficacious than antihistamines; taper to 50 mg/day'], ['Cyclosporine 3–5 mg/kg/day', 'Oral immunosuppressant', 'Effective; monitor renal function'], ['Thalidomide / Lenalidomide', 'Oral immunomodulator', 'Most recalcitrant cases; requires special registry (teratogenic)'], ] story.append(make_table(headers_pn, rows_pn, [3.0*cm, 3.5*cm, 7.2*cm])) story.append(Spacer(1, 0.4*cm)) # Section 5: Stasis story.append(PageBreak()) story.append(Paragraph("5. STASIS DERMATITIS & VENOUS ULCERS", h2_style)) story.append(Paragraph("Stasis Dermatitis", h3_style)) story.append(Paragraph("Cause: Venous insufficiency → increased hydrostatic pressure → eczema on lower legs. Most common site: medial malleolus.", body_style)) headers_stasis = ['Stage', 'Appearance', 'Treatment'] rows_stasis = [ ['Subacute', 'Winter onset; dry/scaly; brown hemosiderin staining (iron from RBC breakdown)', 'Group II–V topical steroid creams + lubricants'], ['Acute', 'Sudden red itchy plaque; weeping/crusts; id reaction possible', 'Wet Burow\'s solution compresses (30-60 min several times/day) + oral anti-Staph antibiotics (cephalexin)'], ['Chronic', 'Cyanotic red plaque; fibrosis; cobblestone skin; permanent brown hyperpigmentation', 'Topical steroids; treat underlying venous disease; compression'], ] story.append(make_table(headers_stasis, rows_stasis, [2.0*cm, 5.5*cm, 6.2*cm])) story.append(Paragraph("⚠️ NEVER apply steroid creams directly onto the ulcer – it stops the healing process! Elevate legs.", warning_style)) story.append(Paragraph("⚠️ Avoid neomycin, parabens, lanolin in topical products (high sensitization risk in venous skin)", warning_style)) story.append(Spacer(1, 0.2*cm)) story.append(Paragraph("3 Types of Leg Ulcers Compared", h3_style)) headers_ulcer = ['Feature', 'Venous', 'Arterial', 'Neuropathic'] rows_ulcer = [ ['Location', 'Medial malleolus', 'Distal, bony prominences', 'Pressure points (metatarsal head, heel)'], ['Appearance', 'Shallow, irregular borders', 'Punched-out, well-demarcated; fibrinous base', 'Callus around wound, undermined edges'], ['Pain', 'Dull; improves with leg elevation', 'Severe; does NOT improve with elevation (ischemic)', 'Numbness or burning paresthesia'], ['Exam', 'Varicose veins, edema, dermatitis', 'Absent pulses, shiny skin, no hair', 'No sensation to monofilament'], ['ABI', '>0.9 (normal)', '<0.7 (arterial disease)', 'Normal (unless arterial component)'], ['Risk factors', 'DVT, obesity, leg injury', 'Diabetes, hypertension, smoking', 'Diabetes, leprosy'], ['Treatment pearl', 'Compression therapy + leg elevation', 'Pentoxifylline, vascular surgery; quit smoking', 'Vigorous debridement; pressure avoidance; custom shoes'], ] col_w_ulcer = [2.4*cm, 3.5*cm, 3.5*cm, 4.3*cm] story.append(make_table(headers_ulcer, rows_ulcer, col_w_ulcer)) story.append(Spacer(1, 0.2*cm)) story.append(Paragraph("Compression Therapy", h3_style)) story.append(Paragraph("CORNERSTONE of venous ulcer treatment. Always check ABI before compression:", body_style)) comp_data = [['ABI 0.8–1.2', 'ABI 0.5–0.8', 'ABI < 0.5'], ['HIGH compression', 'Modified compression\n(≤20 mmHg)', 'NO compression']] comp_t = Table(comp_data, colWidths=[doc.width/3]*3) comp_t.setStyle(TableStyle([ ('BACKGROUND', (0,0), (-1,0), colors.HexColor('#283593')), ('TEXTCOLOR', (0,0), (-1,0), colors.white), ('FONTNAME', (0,0), (-1,-1), 'Helvetica-Bold'), ('FONTSIZE', (0,0), (-1,-1), 9), ('ALIGN', (0,0), (-1,-1), 'CENTER'), ('GRID', (0,0), (-1,-1), 0.5, colors.HexColor('#9fa8da')), ('BACKGROUND', (0,0), (0,1), colors.HexColor('#c8e6c9')), ('BACKGROUND', (1,0), (1,1), colors.HexColor('#fff9c4')), ('BACKGROUND', (2,0), (2,1), colors.HexColor('#ffccbc')), ('PADDING', (0,0), (-1,-1), 6), ])) story.append(comp_t) story.append(Spacer(1, 0.3*cm)) # ========== CHAPTER 4 ========== story.append(PageBreak()) story.append(Paragraph("CHAPTER 4: CONTACT DERMATITIS & PATCH TESTING", h1_style)) story.append(Spacer(1, 0.2*cm)) story.append(Paragraph("6. IRRITANT vs. ALLERGIC CONTACT DERMATITIS", h2_style)) headers_irr = ['Feature', 'IRRITANT Contact Dermatitis', 'ALLERGIC Contact Dermatitis'] rows_irr = [ ['Who gets it?', 'Anyone (everyone at risk)', 'Only genetically predisposed individuals'], ['Mechanism', 'Nonimmunologic – physical/chemical damage to skin barrier', 'Type IV delayed hypersensitivity – T-cell mediated (takes 12–48h after re-exposure)'], ['Exposures needed', 'Few to many (depends on barrier integrity)', 'One or several to sensitize; then rapid on re-exposure'], ['Typical substance', 'Organic solvents, alkaline soaps, detergents', 'Low-MW haptens: nickel, formalin, epoxy resins'], ['Onset', 'Gradual as barrier breaks down', 'Rapid: 12–48 hours after re-exposure once sensitized'], ['Distribution', 'Confined exactly to area of contact', 'May spread beyond contact area'], ['Diagnosis', 'Trial of avoidance (no specific test)', 'Patch testing confirms diagnosis'], ['Management', 'Protection + reduce irritant exposure + moisturizers', 'Complete avoidance of the allergen'], ] story.append(make_table(headers_irr, rows_irr, [3.0*cm, 5.8*cm, 4.9*cm])) story.append(Spacer(1, 0.3*cm)) story.append(Paragraph("7. RHUS DERMATITIS (Poison Ivy / Oak / Sumac)", h2_style)) story.append(Paragraph("Most common cause of allergic contact dermatitis in the USA. Allergen: URUSHIOL (resinous sap).", body_style)) story.append(Paragraph("Hallmark: Linear vesicular eruption (plant dragged across skin while scratching). Blister fluid does NOT spread the reaction.", body_style)) story.append(Paragraph("Cross-reacts with: Cashew nut shells, mango tree, Japanese lacquer tree, ginkgo", body_style)) story.append(Paragraph("Washing Rule:", h3_style)) wash_data = [['Time after exposure', 'Urushiol removed'], ['< 10 minutes', 'ALL removed (100%)'], ['After 10 minutes', 'Only 50% removed'], ['After 30 minutes', 'Only 10% removed'], ['After 60 minutes', '0% removed (too late)']] wash_t = Table(wash_data, colWidths=[5*cm, 5*cm]) wash_t.setStyle(TableStyle([ ('BACKGROUND', (0,0), (-1,0), colors.HexColor('#1a237e')), ('TEXTCOLOR', (0,0), (-1,0), colors.white), ('FONTNAME', (0,0), (-1,-1), 'Helvetica'), ('FONTSIZE', (0,0), (-1,-1), 9), ('ALIGN', (0,0), (-1,-1), 'CENTER'), ('GRID', (0,0), (-1,-1), 0.5, colors.grey), ('ROWBACKGROUNDS', (0,1), (-1,-1), [colors.white, colors.HexColor('#e8eaf6')]), ('BACKGROUND', (0,1), (-1,1), colors.HexColor('#c8e6c9')), ('BACKGROUND', (0,4), (-1,4), colors.HexColor('#ffccbc')), ('PADDING', (0,0), (-1,-1), 5), ])) story.append(wash_t) story.append(Spacer(1, 0.2*cm)) story.append(Paragraph("Treatment of Poison Ivy:", h3_style)) piv_items = [ "• MILD: Cool wet compresses; topical steroids (Group I–V); calamine lotion; hydroxyzine for itch", "• SEVERE: Prednisone 60 mg/day × 4 days → taper over 14 days total (or 20 mg twice daily × ≥7 days)", "• Non-compliant patients: Triamcinolone acetonide 40 mg IM", "⚠️ DO NOT use steroid dose packs (Medrol Dosepak) – inadequate dose; causes rebound dermatitis", ] for item in piv_items: story.append(Paragraph(item, bullet_style)) story.append(Spacer(1, 0.3*cm)) story.append(Paragraph("8. METAL DERMATITIS", h2_style)) story.append(Paragraph("Nickel – #1 cause of allergic contact dermatitis worldwide (mainly women; men sensitized industrially)", body_style)) story.append(Paragraph("Classic sites: Earrings → earlobes; watches → wrists; belt buckles → abdomen", body_style)) story.append(Paragraph("Low-Nickel Diet (for pompholyx or hand eczema in nickel-sensitive patients):", h3_style)) nickel_data = [ ['HIGH Nickel – AVOID', 'LOW Nickel – ALLOWED'], ['Dark chocolate, cocoa powder, nuts (hazel, almonds, peanuts, walnuts)\nLegumes (soybeans, beans, chickpeas, lentils)\nOatmeal, oat bran, wheat bran, soy flour\nMussels, shellfish\nAll canned foods', 'Meat, poultry, eggs\nMilk, cheese, yogurt, butter\nPolished rice and refined wheat flour\nMost vegetables (potatoes, cabbage, carrots, cucumbers)\nFresh fruits (except pears)\nFish (except herring, oysters, shellfish)'] ] nickel_t = Table(nickel_data, colWidths=[doc.width/2, doc.width/2]) nickel_t.setStyle(TableStyle([ ('BACKGROUND', (0,0), (-1,0), colors.HexColor('#1a237e')), ('TEXTCOLOR', (0,0), (-1,0), colors.white), ('FONTNAME', (0,0), (-1,-1), 'Helvetica'), ('FONTSIZE', (0,0), (-1,-1), 8), ('BACKGROUND', (0,1), (0,1), colors.HexColor('#ffebee')), ('BACKGROUND', (1,1), (1,1), colors.HexColor('#e8f5e9')), ('GRID', (0,0), (-1,-1), 0.5, colors.grey), ('VALIGN', (0,0), (-1,-1), 'TOP'), ('PADDING', (0,0), (-1,-1), 6), ])) story.append(nickel_t) story.append(Spacer(1, 0.3*cm)) story.append(Paragraph("9. PATCH TESTING", h2_style)) story.append(Paragraph("Indicated for: persistent eczema unresponsive to treatment; recurring eczema; unusual distribution", body_style)) headers_patch = ['Grade', 'Interpretation', 'Notes'] rows_patch = [ ['+', 'Weak positive: erythema, infiltration, papules', 'Nonvesicular'], ['++', 'Strong positive: edema or vesicles', 'Clinically significant'], ['+++', 'Extreme positive: spreading, bullous, ulcerative', 'May be true anaphylaxis risk'], ['IR', 'IRRITANT reaction (deep erythema, like burn)', 'NOT a positive allergy test!'], ['NT', 'Not tested', '—'], ] story.append(make_table(headers_patch, rows_patch, [1.2*cm, 5.5*cm, 7.0*cm])) story.append(Spacer(1, 0.2*cm)) story.append(Paragraph("⚠️ When NOT to patch test:", warning_style)) no_patch = [ "• Active flaring dermatitis >25% BSA → 'angry back syndrome' = false positives", "• Patient on systemic corticosteroids → wait at least 2 weeks after stopping", "• After PUVA or UV phototherapy → wait 1–2 weeks", ] for item in no_patch: story.append(Paragraph(item, bullet_style)) story.append(Paragraph("Top Allergens (North American Contact Dermatitis Group 2013-2014):", h3_style)) story.append(Paragraph("1. Nickel sulfate (20.1%) | 2. Fragrance mix (11.9%) | 3. Methylisothiazolinone (10.9%) | 4. Neomycin (8.4%) | 5. Bacitracin (7.4%) | 6. Cobalt chloride (7.4%) | 7. Myroxylon pereirae/Balsam of Peru (7.2%) | 8. p-Phenylenediamine (7.0%) | 9. Formaldehyde (7.0%)", body_style)) story.append(Spacer(1, 0.5*cm)) # ========== CHAPTER 5 ========== story.append(PageBreak()) story.append(Paragraph("CHAPTER 5: ATOPIC DERMATITIS (AD)", h1_style)) story.append(Spacer(1, 0.2*cm)) story.append(Paragraph("10. OVERVIEW & PATHOGENESIS", h2_style)) overview_data = [[ "ATOPIC DERMATITIS OVERVIEW\n\n" "• Chronic, pruritic, relapsing inflammatory skin disease\n" "• Affects 15–25% children; 7.2% adults in the USA\n" "• Closely associated with elevated serum IgE\n" "• Personal/family history of asthma, allergic rhinitis ('atopic triad')\n" "• 45% of AD begins in first 6 months of life\n" "• Polygenic inheritance: 77% concordance in identical twins\n\n" "KEY PATHOLOGY: Filaggrin (FLG) gene mutation → weakened skin barrier → " "Staphylococcus aureus colonization → TH-2 cytokine dominance → more inflammation" ]] ov_t = Table(overview_data, colWidths=[doc.width]) ov_t.setStyle(TableStyle([ ('BACKGROUND', (0,0), (-1,-1), colors.HexColor('#e8eaf6')), ('FONTNAME', (0,0), (-1,-1), 'Helvetica'), ('FONTSIZE', (0,0), (-1,-1), 9), ('TEXTCOLOR', (0,0), (-1,-1), colors.HexColor('#1a237e')), ('PADDING', (0,0), (-1,-1), 10), ('BOX', (0,0), (-1,-1), 1.5, colors.HexColor('#3949ab')), ])) story.append(ov_t) story.append(Spacer(1, 0.3*cm)) story.append(Paragraph("11. CLINICAL PHASES OF AD", h2_style)) headers_phase = ['Phase', 'Age', 'Distribution', 'Key Features'] rows_phase = [ ['INFANT', 'Birth – 2 yrs', 'Cheeks (spares perioral/paranasal areas); chin; scalp; diaper area SPARED', 'Starts ~3rd month; erythema, scaling, crusting; habitual lip licking → perioral eczema; restless, agitated sleep'], ['CHILDHOOD', '2 – 12 yrs', 'FLEXURAL areas: antecubital/popliteal fossae, neck, wrists, ankles', 'Perspiration triggers itch; lichenification develops; hypopigmented areas from melanocyte destruction by scratching'], ['ADULT', '12 yrs → adult', 'Flexures + HANDS (most common adult expression) + eyelids + anogenital area', 'Onset at puberty; localized lichenification; hand dermatitis may be severe; anogenital lichenification resistant to treatment'], ] story.append(make_table(headers_phase, rows_phase, [2.0*cm, 2.0*cm, 4.5*cm, 5.2*cm])) story.append(Spacer(1, 0.3*cm)) story.append(Paragraph("12. TRIGGERING FACTORS", h2_style)) headers_trig = ['Trigger', 'Mechanism & Notes'] rows_trig = [ ['Temperature change / Sweating', 'Sweating → burning and intense itching in fossae; hot showers provide temporary relief but worsen with drying'], ['Low humidity (fall/winter)', 'Cold air cannot hold moisture; skin loses water-binding lipids → dry, fragile, itchy skin'], ['Excessive washing', 'Removes water-binding lipids from stratum corneum; daily baths tolerated only if moisturizer applied within 3 min'], ['Staphylococcus aureus', '#1 skin microorganism in AD lesions; systemic/topical antibiotics can dramatically improve AD'], ['House dust mites', 'Most important aeroallergen; positive patch test rates ~70%; avoidance rarely improves but worth trying'], ['Foods (young children)', 'Eggs, milk, peanuts, soy, wheat are top offenders in children <5 years with moderate-severe AD'], ['Emotional stress', 'Can trigger sudden widespread flare; disease is WORSENED by (not caused by) emotional stress'], ['Wool, chemicals, cosmetics', 'Direct irritation → intolerance reaction; atopic patients have lower threshold for irritants'], ] story.append(make_table(headers_trig, rows_trig, [4.2*cm, 9.5*cm])) story.append(Spacer(1, 0.3*cm)) story.append(Paragraph("13. ASSOCIATED FEATURES OF AD", h2_style)) headers_feat = ['Feature', 'Description', 'Treatment'] rows_feat = [ ['Xerosis (dry skin)', 'Most common; itchy; worse in winter; affects extensor surfaces especially', 'Avoid frequent washing; mild soaps; apply moisturizers immediately after bath'], ['Ichthyosis vulgaris', 'Dry rectangular white scales on extensor arms/legs; commonly co-exists with AD and keratosis pilaris', '12% ammonium lactate lotion or urea cream'], ['Keratosis pilaris', 'Small rough follicular papules on posterolateral upper arms and anterior thighs; peaks in adolescence', 'Ammonium lactate 12%, urea cream (10–40%), salicylic acid 6%'], ['Hyperlinear palmar creases', 'Accentuated palm lines; present in infancy; worsens with disease severity', 'Moisturizers (cosmetic only; don\'t improve creases)'], ['Pityriasis alba', 'Hypopigmented round plaques on face/arms; common in children; disappears by adulthood', 'No treatment needed; tacrolimus 0.1% twice daily if eczematous'], ['Cataracts', '1–25% prevalence; associated with chronic systemic steroid use', 'Annual ophthalmologic screening in chronic AD; check IOP with periocular topical steroids'], ] story.append(make_table(headers_feat, rows_feat, [3.2*cm, 5.5*cm, 4.9*cm])) story.append(Spacer(1, 0.3*cm)) # Treatment story.append(PageBreak()) story.append(Paragraph("14. TREATMENT OF ATOPIC DERMATITIS (Step-wise)", h2_style)) steps = [ ("STEP 1: DRY SKIN CONTROL", [ "• Daily bath + apply moisturizer WITHIN 3 MINUTES (soak and smear technique)", "• Use unscented petrolatum or cream (NOT lotion – less effective)", "• Humidify home in winter (target >50% humidity)", "• Avoid frequent washing, drying soaps, and wool clothing", ]), ("STEP 2: TOPICAL ANTI-INFLAMMATORY THERAPY", [ "• Topical Corticosteroids (TCS) – FIRST-LINE therapy", " - Apply for 2 weeks, then rest 1 week, then restart", " - Use MID-to-HIGH strength initially (do NOT start with hydrocortisone – too weak)", " - Face/eyelids: use desonide OR calcineurin inhibitors (no atrophy risk)", " - Lichenified plaques: Group I–II + occlusion for 10-14 days", " - Maintenance: Apply fluticasone once daily on weekends to prevent relapse", "", "• Pimecrolimus (Elidel) 1% cream – STEROID-SPARING for mild-moderate AD (≥2 yrs)", " - Apply twice daily; safe on face; stop when eczema clears", "", "• Tacrolimus (Protopic) 0.03% (children) or 0.1% (adults) ointment", " - For moderate-severe AD; second-line; apply twice daily", " - Burning/stinging is most common side effect (resolves within days)", " - Safe around eyes; does NOT cause skin atrophy", " - ⚠️ Avoid prolonged continuous use; avoid excessive UV exposure", "", "• Crisaborole (Eucrisa) 2% ointment – PDE-4 inhibitor", " - Mild-moderate AD in patients ≥2 yrs; apply twice daily", " - Side effect: Pain at application site", ]), ("STEP 3: TREAT INFECTION", [ "• Bleach baths: ¼–½ cup household bleach in full bathtub (daily or weekly)", "• Oral antibiotics (anti-Staph): Cephalexin, Cefadroxil – START 2 DAYS BEFORE topical steroids", "• Intranasal mupirocin: Reduce recurrent Staph infections from nasal carriage", ]), ("STEP 4: CONTROL ITCHING", [ "• Hydroxyzine – sedating; useful at bedtime", "• Doxepin HCl cream 5% (Zonalon) – apply 4x/day; may cause drowsiness", "• ⚠️ Nonsedating antihistamines have LIMITED evidence for AD pruritus", ]), ("STEP 5: PHOTOTHERAPY", [ "• Narrowband UVB 311 nm – effective for mild/moderate/severe AD", "• UVA1 – superior for severe AD vs conventional UVA-UVB", "• PUVA – effective but increasing risk of long-term carcinogenicity → many clinicians avoid", ]), ] for step_title, step_items in steps: step_data = [[step_title + '\n' + '\n'.join(step_items)]] step_t = Table(step_data, colWidths=[doc.width]) step_t.setStyle(TableStyle([ ('BACKGROUND', (0,0), (-1,-1), colors.HexColor('#f5f5f5')), ('FONTNAME', (0,0), (-1,-1), 'Helvetica'), ('FONTSIZE', (0,0), (-1,-1), 8.5), ('PADDING', (0,0), (-1,-1), 8), ('BOX', (0,0), (-1,-1), 1, colors.HexColor('#9fa8da')), ('LEFTPADDING', (0,0), (-1,-1), 10), ])) story.append(step_t) story.append(Spacer(1, 0.2*cm)) story.append(Paragraph("STEP 6: SYSTEMIC IMMUNOSUPPRESSIVE THERAPY (Severe, Refractory AD)", h3_style)) headers_sys = ['Drug', 'Mechanism', 'Key Notes'] rows_sys = [ ['Cyclosporine\n(2.5–5 mg/kg/day)', 'Inhibits T cells and cytokine expression', 'Most commonly used; effective in children & adults; prefer short-term; max 1 year'], ['Methotrexate\n(7–25 mg weekly)', 'Inhibits folic acid and DNA synthesis', 'Give folic acid supplementation; monitor LFTs and CBC'], ['Azathioprine', 'Purine analog; suppresses T and B cells', 'Check TPMT level first to determine safe dosing'], ['Mycophenolate mofetil\n(500 mg–1 g twice daily)', 'Impairs purine synthesis; selective B/T cell suppression', 'Highly effective; no serious adverse effects reported'], ['Oral corticosteroids', 'Broad antiinflammatory', '⚠️ Short-term bridge ONLY; high relapse rate; avoid routine use; risk of cataracts'], ] story.append(make_table(headers_sys, rows_sys, [3.5*cm, 4.0*cm, 6.2*cm])) story.append(Spacer(1, 0.2*cm)) story.append(Paragraph("DUPILUMAB (DUPIXENT) – Biologic Drug", h3_style)) dup_data = [[ "MECHANISM: Human monoclonal IgG4 antibody → binds IL-4Rα → blocks IL-4 and IL-13 signaling\n\n" "INDICATION: Moderate-to-severe AD in adults and adolescents failing topical therapy\n\n" "DOSE: Initial 600 mg subcutaneous, then 300 mg every 2 weeks (adults/adolescents ≥60kg)\n\n" "SIDE EFFECTS: Conjunctivitis (~16%) – refer to ophthalmology if persistent\n\n" "⚠️ AVOID live vaccines while on dupilumab" ]] dup_t = Table(dup_data, colWidths=[doc.width]) dup_t.setStyle(TableStyle([ ('BACKGROUND', (0,0), (-1,-1), colors.HexColor('#e8f5e9')), ('FONTNAME', (0,0), (-1,-1), 'Helvetica'), ('FONTSIZE', (0,0), (-1,-1), 9), ('TEXTCOLOR', (0,0), (-1,-1), colors.HexColor('#1b5e20')), ('PADDING', (0,0), (-1,-1), 10), ('BOX', (0,0), (-1,-1), 1.5, colors.HexColor('#2e7d32')), ])) story.append(dup_t) story.append(Spacer(1, 0.3*cm)) # ========== FINAL SUMMARY ========== story.append(PageBreak()) story.append(Paragraph("QUICK SUMMARY COMPARISON TABLE", h1_style)) story.append(Spacer(1, 0.2*cm)) headers_sum = ['Condition', 'Classic Trigger', 'Classic Location', 'Treatment Pearl'] rows_sum = [ ['Irritant Contact Dermatitis', 'Repeated chemicals/water', 'Hands (back)', 'Barrier protection + moisturizers'], ['Allergic Contact Dermatitis', 'Sensitizing allergen (nickel, rubber, fragrance)', 'Corresponds to allergen contact area', 'Patch test → identify + avoid allergen completely'], ['Atopic Dermatitis', 'Genetic + multiple triggers (Staph, allergens)', 'Flexures (children); hands (adults)', 'Moisturize + topical steroids/TCIs; dupilumab for severe'], ['Stasis Dermatitis', 'Venous insufficiency', 'Medial lower legs', 'Compression is cornerstone; elevate legs'], ['Nummular Eczema', 'Unknown', 'Coin-shaped on extremities/trunk', 'Treat as subacute/chronic eczema; tacrolimus 0.1%'], ['Pompholyx (Dyshidrosis)', 'Unknown; nickel/cobalt in some', 'Palms and sides of fingers, soles', 'Topical steroids; PUVA for resistant; low-metal diet'], ['Lichen Simplex Chronicus', 'Habitual scratching', 'Neck, genitals, lower legs, wrists', 'STOP scratching; potent topical steroids; intralesional triamcinolone'], ['Asteatotic Eczema (Craquelé)', 'Dry skin (winter/elderly)', 'Anterolateral lower legs, "cracked porcelain"', 'Topical steroids + emollients; DO NOT use oral steroids'], ['Rhus (Poison Ivy) Dermatitis', 'Urushiol contact', 'Linear vesicles; varies', 'Wash immediately; prednisone for severe; no steroid dose packs'], ['Prurigo Nodularis', 'Chronic picking/scratching', 'Extensor arms and legs', 'Intralesional steroids; calcipotriol; gabapentin; dupilumab'], ] story.append(make_table(headers_sum, rows_sum, [3.2*cm, 3.5*cm, 3.5*cm, 3.5*cm])) story.append(Spacer(1, 0.3*cm)) story.append(Paragraph("⭐ HIGH-YIELD CLINICAL PEARLS", h2_style)) pearls = [ "1. Topical steroid creams should NEVER be applied directly onto ulcers – it stops the healing process.", "2. Wet compresses in asteatotic eczema: Use for MAX 1–2 days only; prolonged use → excessive drying.", "3. Medrol Dosepak (steroid dose packs) are INADEQUATE for poison ivy or severe AD – causes rebound.", "4. In hand eczema, ALWAYS consider patch testing even if the pattern looks like irritant dermatitis.", "5. Adult-onset recalcitrant eczema (no clear cause) → rule out cutaneous T-cell lymphoma.", "6. Tacrolimus (Protopic) is SAFE on the face and around eyes – no skin atrophy unlike topical steroids.", "7. In stasis dermatitis, AVOID neomycin, parabens, lanolin → high sensitization risk in venous skin.", "8. Generalized eczema/intractable pruritus in adults may be a sign of Hodgkin lymphoma.", "9. Bleach baths reduce Staphylococcus aureus colonization effectively in atopic dermatitis.", "10. Filaggrin mutation → weak skin barrier → Staph colonization → TH-2 dominant inflammation → worsened AD.", "11. In poison ivy: Washing within 10 minutes removes ALL urushiol; after 30 minutes, only 10% removed.", "12. Pompholyx blister fluid does NOT spread the reaction (common misconception).", "13. Patch test should be read at 48h AND again at 3–7 days (neomycin reactions often delayed).", "14. Before compression therapy for venous ulcers, ALWAYS check Ankle-Brachial Index (ABI).", "15. Dupilumab (Dupixent) blocks IL-4 and IL-13; major side effect = conjunctivitis (~16% of patients).", ] for pearl in pearls: story.append(Paragraph(pearl, bullet_style)) story.append(Spacer(1, 0.5*cm)) story.append(HRFlowable(width="100%", thickness=1, color=colors.HexColor('#1a237e'))) story.append(Spacer(1, 0.2*cm)) story.append(Paragraph("Source: Habif's Clinical Dermatology — Chapters 3, 4, and 5", ParagraphStyle('Footer', parent=styles['Normal'], fontSize=8, alignment=TA_CENTER, textColor=colors.grey))) doc.build(story) print("PDF generated successfully!") PYEOF

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What's Covered (with ALL treatments included):

Chapter 3 - Eczema & Hand Dermatitis

Topic	✅
3 Stages of Eczema (Acute/Subacute/Chronic) with treatment for each	✅
8 Types of Hand Eczema with treatments	✅
Pompholyx - detailed treatment (topical steroids, PUVA, methotrexate, low-nickel diet)	✅
Asteatotic Eczema (Craquelé) + associated diseases	✅
Chapped Fissured Feet	✅
Lichen Simplex Chronicus	✅
Prurigo Nodularis - full evidence-based drug table (12 treatments)	✅
Neurotic Excoriations + Psychogenic Parasitosis	✅
Stasis Dermatitis + 3 types of leg ulcers compared	✅
Venous ulcer treatment + compression therapy with ABI table	✅

Chapter 4 - Contact Dermatitis

Topic	✅
Irritant vs. Allergic - full comparison table	✅
Poison Ivy - washing timeline + treatment (prednisone dosing)	✅
Latex/Rubber allergy - 3 types with treatments	✅
Nickel allergy + full low-nickel diet table	✅
Patch testing - technique, grading, when NOT to do it	✅

Chapter 5 - Atopic Dermatitis

Topic	✅
Pathogenesis (filaggrin, TH-2, Staph)	✅
3 Clinical phases (Infant/Childhood/Adult)	✅
All triggering factors	✅
Associated features (ichthyosis, keratosis pilaris, pityriasis alba)	✅
Full stepwise treatment (moisturizers → topical steroids → TCIs → crisaborole → biologics)	✅
Dupilumab (Dupixent) - mechanism, dosing, side effects	✅
Cyclosporine, Methotrexate, Azathioprine, MMF details	✅
Food allergy management in AD	✅

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DERMATITIS – EASY STUDY NOTES

Source: Habif's Clinical Dermatology (Chapters 3, 4, 5)

CHAPTER 3: ECZEMA & HAND DERMATITIS

1. THREE STAGES OF ECZEMA

ACUTE ECZEMA

Look: Red, swollen, tiny clear vesicles, may blister or ooze
Feel: Intense itch (even during sleep)
Examples: Poison ivy, id reaction, pompholyx, acute nummular eczema
Treatment: Cool wet compresses, oral or intramuscular steroids, topical steroids, antihistamines, antibiotics

SUBACUTE ECZEMA

Look: Red + scaling, dry, indistinct borders, "parched" or "scalded" appearance
Feel: Slight to moderate itch, burning, stinging
Examples: Atopic dermatitis, contact dermatitis, stasis dermatitis, nummular eczema
Treatment: Topical steroids (with or without occlusion), lubrication, antihistamines, tar; STOP wet dressings at this stage

CHRONIC ECZEMA

Look: Thick skin, accentuated skin lines = lichenification ("washboard" appearance), excoriations, fissuring
Feel: Moderate to intense itch
Examples: Lichen simplex chronicus, atopic dermatitis, hyperkeratotic eczema, chapped fissured feet
Treatment: Potent topical steroids + occlusion, intralesional steroid injection, antihistamines, lubrication

KEY POINT: Eczema can start at any stage and move to another. Secondary infection converts subacute into acute. Habitual scratching converts subacute into chronic.

2. HAND ECZEMA

Types:

Irritant contact dermatitis - Most common (35%); "dishpan hands" - Back of hands, fingers
Atopic hand dermatitis - History of childhood eczema - Back of hands
Allergic contact dermatitis - Patch test positive; 19% of cases - Varies by allergen
Pompholyx (dyshidrosis) - Deep-seated vesicles on palms/sides of fingers - Palms, lateral fingers, soles
Fingertip eczema - Dry, fissured, skin lines disappear - Fingertips only
Hyperkeratotic eczema - Dense yellow-brown scale, deep cracks - Palms, mainly in middle-aged men
Nummular eczema - Coin-shaped plaques - Back of hands
Recurrent focal palmar peeling - Noninflammatory peeling in summer - Palms and soles

IRRITANT CONTACT DERMATITIS (Most Common Hand Eczema)

Mechanism: Stratum corneum is damaged by repeated irritants and the skin barrier breaks down.

Who gets it: Mothers with young children (diaper changing), hairdressers, dishwashers, surgeons, dentists, bartenders, fishermen, industrial workers.

Progression: Dryness and chapping → cracks and fissures (especially over joint creases and fingertips) → red swollen backs of hands → vesicles and oozing → (if caustic chemical) necrosis and ulceration.

Patient Instructions:

Wash hands as infrequently as possible; use lukewarm water only
Shampoo with rubber gloves or have someone else do it
Avoid direct contact with household cleaners and detergents
Wear white cotton gloves under unlined rubber gloves

Treatment: Treat by stage (acute/subacute/chronic). Lubrication is essential. Use barrier creams applied at least twice daily on all exposed areas.

ATOPIC HAND DERMATITIS

Most common form of adult atopic dermatitis
Starts as irritant chapping and erythema on back of hands
Predictors: Hand dermatitis before age 15, persistent eczema on body, dry or itchy skin in adult life, widespread childhood atopic dermatitis
Treatment: Same as irritant hand eczema - avoid irritants and lubricate frequently

ALLERGIC CONTACT DERMATITIS (Hands)

Common allergens:

Nickel (door knobs, scissors, jewelry, knitting needles)
Potassium dichromate (cement, leather gloves)
Rubber (gloves, industrial equipment)
Fragrances (cosmetics, soaps, topical medications)
Formaldehyde (wash-and-wear fabrics, cosmetics)
Lanolin (topical lubricants and medications)

Diagnosis: Patch testing confirms the allergen. Treatment: Identify and avoid the allergen; treat active eczema as subacute or chronic.

POMPHOLYX (DYSHIDROSIS)

Symmetric vesicular hand and foot dermatitis of unknown cause
Intense itching precedes vesicles on palms and sides of fingers
Palms are red and wet with perspiration (hence "dyshidrosis" - but NOT actually related to sweat glands)
Vesicles resolve in 3-4 weeks, replaced by rings of scale
Pain rather than itch is the chief complaint in chronic cases
Causes: Allergic contact (67.5%), mycosis (10%), idiopathic atopic (15%)
Nickel, cobalt, and chromium ingestion can trigger it even if patch test is negative

Treatment:

Topical steroids + cool wet compresses (first-line)
Oral antibiotics if secondary infection
Short courses of oral steroids for acute flares
PUVA therapy for resistant cases
Low-dose methotrexate (15-22.5 mg/week) for debilitating cases unresponsive to steroids
Oxybutynin (anticholinergic) may help through its effect on hyperhidrosis
Low-nickel diet if metal-sensitive (64% of patients on diet cleared or markedly improved)

FINGERTIP ECZEMA

Dry, cracked, fissured, tender fingertips; skin lines are lost
Skin peels from fingertip distally; stops before distal interphalangeal joint
Cause: Contact allergy (plant bulbs, resins) or unknown
Chronic and resistant to treatment

Treatment:

Rule out allergy and psoriasis first
Avoid irritants and lubricate frequently
Topical steroids with or without occlusion give only temporary relief
Try pimecrolimus, tacrolimus, crisaborole, or tar creams twice daily

HYPERKERATOTIC ECZEMA

Almost exclusively in men (middle-aged and elderly)
Dense yellow-brown scale on palms that forms deep interconnecting cracks "like mud drying in a riverbed"
Scale is moist below the surface; peeling it away causes bleeding
Cause usually unknown; may result from allergy or irritation

Treatment:

Group II topical steroid cream + occlusion
Recurrences are frequent
Patch test if recurrent

NUMMULAR ECZEMA (Coin-shaped)

Round, coin-shaped (1-5 cm) eczematous plaques
Common in middle-aged and elderly; unknown cause
Back of hands most common site; also extensor forearms and legs, flanks, hips
Vesicles may appear on the plaque surface
Chronic with variable course; some cases resolve, others persist for years

Treatment:

Based on stage of inflammation
Acute (vesicular): treat as acute eczema
Red scaling plaques: treat as subacute eczema
Thick, scratched plaques: treat as chronic eczema
Tacrolimus ointment 0.1% used alone or intermittently with topical steroids

RECURRENT FOCAL PALMAR PEELING

Non-inflammatory, bilateral peeling of palms (occasionally soles)
Most common in summer; associated with sweaty palms
Scaling starts from several points, extends peripherally; central area becomes slightly red and tender
Asymptomatic; chronic and recurrent
Resolves in 1-3 weeks; requires no therapy other than lubrication

3. OTHER ECZEMA PRESENTATIONS

ASTEATOTIC ECZEMA (Eczema Craquelé)

Occurs after excess drying, especially in winter and among the elderly
Atopic patients are more likely to develop this pattern
Most common on anterolateral aspects of lower legs
Look: "Cracked porcelain" or "crazy paving" pattern - long horizontal fissures connect with short vertical fissures
Pain rather than itching is the chief complaint in severe cases
Scratching or using drying lotions (calamine) makes it much worse

Associated conditions: Malignancy (lymphoma, leukemia, solid organ tumors), malnutrition, anorexia nervosa, Sjögren syndrome, chronic graft-versus-host disease, CHF, nephrotic syndrome, cirrhosis, retinoids use.

Treatment:

Initial/mild stages: Group III or IV topical steroid ointments (treat as subacute eczema)
Severe form: Wet compresses + antibiotics first to remove crust and suppress infection, THEN Group V topical steroids + lubricants
Wet compresses only for 1-2 days (prolonged use causes excessive drying)
Lubrication during and after topical steroid use is essential
AVOID oral steroids - disease flares within 1-2 days after stopping them

CHAPPED FISSURED FEET (Sweaty Sock Dermatitis / Juvenile Plantar Dermatosis)

Age of onset: Mean 7.3 years; mean remission at 14.3 years (disappears around puberty)
Cause: Moist socks kept in contact with soles inside impermeable shoes = artificial intertrigo
Look: Scaling, erythema, fissuring, and loss of epidermal ridge pattern; starts on toes and metatarsal regions; entire sole may be involved
Worsens throughout winter; clears in late spring; predictably recurs in fall
Complaint: Soreness and pain (NOT itch like atopic dermatitis of the feet)

Differential Diagnosis:

Psoriasis: darker red, scales shed (in chapped feet, scales are adherent and removal causes bleeding)
Tinea pedis: rare in children; fissuring is minimal; little seasonal variation
Allergic contact dermatitis: affects dorsal aspect; spares soles; bright red and scaly rather than pale red and chapped

Treatment:

Group II or III topical steroids twice daily (or with plastic wrap occlusion at bedtime)
Tacrolimus ointment may be effective
Lubricating creams applied several times daily, especially directly after removing moist socks
Prevention: Change into light leather shoes after removing boots at school; change cotton socks 1-2 times daily

4. SELF-INFLICTED DERMATOSES

LICHEN SIMPLEX CHRONICUS (LSC / Circumscribed Neurodermatitis)

Created and perpetuated by habitual scratching of a single localized area
More common in adults; patients derive pleasure from scratching
Look: Red, scaly, THICK plaque with ACCENTUATED skin lines (lichenification); well-defined border
Usually just one lesion; stays localized; does not enlarge significantly
The disease is self-perpetuating: scratching → thickening → more itch → more scratching

Sites (in order of frequency):

Outer lower portion of lower leg
Scrotum, vulva, anal area, pubis
Wrists and ankles
Upper eyelids
Back and side of neck (lichen simplex nuchae - almost exclusively women)
Orifice of the ear
Extensor forearms near elbow
Fold behind the ear
Scalp (picker's nodules)

Treatment:

FIRST: Explain to patient that the rash will not clear until all scratching and rubbing is stopped
Cover the area at night if scratching occurs during sleep
Topical steroids: Clobetasol is very effective for neck, legs, wrists, ankles, and vulva
Intertriginous areas (anal, fold behind ear): Group V or VI steroids only (not potent steroids)
Lichen simplex nuchae (back of neck) - difficult to treat; fluocinonide applied twice daily for scalp extension
Intralesional triamcinolone acetonide 10 mg/mL - very effective; may give monthly
Cordran tape (occlusive steroid tape)
Oral antibiotics if secondarily infected

PRURIGO NODULARIS

Nodular form of lichen simplex chronicus; intractable pruritus
Look: Few to 20+ nodules, 1-2 cm, hard, dome-shaped, smooth or warty or crusted surface
Location: Extensor aspects of arms and legs (randomly distributed)
Neural hyperplasia is a constant feature
Resistant to treatment; lasts for years

Evidence-Based Treatments:

TOPICAL:

Betamethasone 0.1% ointment: Twice daily with occlusion; alternate with steroid-sparing agents
Calcipotriol 50 mcg/g ointment: Twice daily; may be more efficacious than betamethasone
Pimecrolimus 1% cream: Twice daily; discuss FDA black-box warning with patient
Tacrolimus 0.1% ointment: Twice daily; discuss FDA black-box warning
Capsaicin 0.025%-0.3%: Apply 4-6 times daily; high application frequency leads to low compliance; gradual healing over months

ORAL:

Fexofenadine (240 mg twice daily) + Montelukast (10 mg daily): Reduces pruritus
Naltrexone 50 mg/day: Opioid antagonist; 41% exacerbation rate after stopping
Gabapentin 900 mg/day for 3-4 months; taper to 300-600 mg/day for maintenance
Pregabalin 25 mg 3 times/day for 3 months; taper to 50 mg/day; more efficacious than antihistamines
Cyclosporine 3-5 mg/kg/day: Effective in studies
Thalidomide and lenalidomide: For most recalcitrant cases; REQUIRE special registry (embryo-fetal toxicity)

PROCEDURAL:

Intralesional triamcinolone acetonide 10 mg/mL injections: Very effective; give monthly
Cryotherapy: Sometimes successful
Excision of individual nodules: Sometimes helpful

NEUROTIC EXCORIATIONS

Patient-induced linear excoriations; most patients aware they create the lesions
Psychiatric associations: OCD, perfectionistic and compulsive traits, depression, anxiety, somatoform disorders
Look: Few to several hundred excoriations in easily reached areas; face is most common site; also extensor arms and legs, abdomen, thighs, upper back and shoulders
Groups of white scars surrounded by brown hyperpigmentation are characteristic

Treatment:

Group I topical steroids twice daily OR Group V under plastic wrap occlusion
Systemic antibiotics
Intralesional triamcinolone acetonide 10 mg/mL for resistant lesions
Frequent lubrication; encourage substituting lubricant application ritual for the digging ritual
Empathic, supportive approach (significantly more effective than insight-oriented psychotherapy)
Antidepressants (SSRIs, SSNRIs, TCAs) for depression
Behavioral therapy for OCD
Psychiatric referral if supportive approach fails

PSYCHOGENIC PARASITOSIS (Delusional Infestation)

Conviction that skin is infested with organisms despite no objective evidence
Mostly female, long history of symptoms, disabled or retired, seen at many centers
"Matchbox sign": Patient brings skin debris, dried blood, fibers, or "insects" in matchboxes as proof
Patients describe infestation with insects, worms, fibers - almost half report multiple entities

Management:

Rule out true infestation (scabies, animal/bird mites can actually be present)
Listen and show concern; examine skin with magnification; prepare scrapings
Do NOT suggest the diagnosis is obvious on first visit
Collect specimens brought by patient; set them aside for later evaluation
If belief is shakable: Offer benzodiazepine for anxiety + suggest psychiatric referral at 2-week follow-up
If belief is unshakable (true delusional disorder): Antipsychotics - Pimozide (Orap), Risperidone (Risperdal), Olanzapine (Zyprexa), or Quetiapine (Seroquel)
Antidepressants may be added for comorbid depressive disease

5. STASIS DERMATITIS AND VENOUS ULCERS

STASIS DERMATITIS

Cause: Venous insufficiency → increased hydrostatic pressure → eczematous eruption on lower legs. Occurs over medial malleolus most commonly.

Three Stages:

SUBACUTE INFLAMMATION:

Usually begins in winter; legs become dry and scaly
Brown staining of skin = hemosiderin (iron remaining from disintegrated RBCs that leaked from veins)
Treatment: Group II-V topical steroid creams/ointments + lubricating creams/lotions

ACUTE INFLAMMATION:

Sudden red, superficial itchy plaque on lower leg
May have weeping, crusts, fissuring
May trigger id reaction (vesicular eruption) on palms, trunk, or extremities
Treatment: Oral anti-Staph antibiotics (cephalexin) + tepid wet compresses + Group III-V topical steroids
Id reaction resolves spontaneously as primary site improves

CHRONIC INFLAMMATION:

Cyanotic red plaque over medial malleolus
Fibrosis → permanent skin thickening; cobblestone/bumpy appearance
Skin remains thickened and diffusely dark brown (postinflammatory hyperpigmentation) during quiet periods
Treatment: Topical steroids; treat underlying venous disease; compression

IMPORTANT RULES FOR STASIS DERMATITIS:

NEVER apply steroid creams directly onto the ulcer - it stops the healing process
ALWAYS elevate the legs
AVOID neomycin, parabens, and lanolin in topical products - high sensitization risk in venous skin
Patch test if inflammation persists after appropriate treatment

VENOUS LEG ULCERS

THREE TYPES OF LEG ULCERS COMPARED:

VENOUS ULCER:

Location: Medial malleolus
Appearance: Shallow, irregular borders; base develops granulation tissue
Pain: Dull; IMPROVES with leg elevation
Exam: Varicose veins, leg edema, dermatitis, skin thickening
ABI: Greater than 0.9 (normal)
Risk factors: DVT, obesity, significant leg injury
Treatment: Compression therapy + leg elevation (cornerstone)

ARTERIAL ULCER:

Location: Distal, over bony prominences
Appearance: Round, punched-out, well-demarcated; fibrinous yellow base or necrotic eschar
Pain: Severe; does NOT improve with elevation
Exam: Absent or decreased pulses, shiny atrophic skin, no hair, dystrophic toenails
ABI: Less than 0.7
Risk factors: Diabetes, hypertension, smoking, hypercholesterolemia
Treatment: Pentoxifylline, vascular surgery assessment; patient must quit smoking

NEUROPATHIC ULCER:

Location: Pressure points on feet (metatarsal head, heel, junction of hallux and plantar surface)
Appearance: Callus surrounding wound, undermined edges, bone/tendon exposure possible
Pain: Foot numbness, burning, paresthesia (patient may feel nothing)
Exam: No sensation to monofilament, Charcot joints, claw toes
ABI: Normal
Risk factors: Diabetes, leprosy, frostbite
Treatment: Vigorous surgical debridement; pressure avoidance; custom-molded shoes

TREATMENT OF VENOUS ULCERS

Step 1 - Reduce venous pressure and edema: Bed rest, leg elevation, compression bandages/stockings

Step 2 - Control surrounding inflammation: Tepid wet Burow's solution compresses (30-60 min, several times/day) + Group V topical steroids applied 2-4 times/day

Step 3 - Treat infection: Systemic antibiotics (anti-Staph: cephalexin); topical antibiotics (Iodoflex pad, Iodosorb gel); Silver nitrate 0.5% compresses preferred when infection present

Step 4 - Debride ulcer bed: Enzyme-debriding agents; surgical or mechanical debridement; replace compresses hourly for first 24-72 hours to debride

Step 5 - Use appropriate dressings: Occlusive dressings promote rapid healing and wound debridement

Step 6 - COMPRESSION is the cornerstone:

Check Ankle-Brachial Index (ABI) BEFORE applying compression
ABI 0.8-1.2: High compression therapy
ABI 0.5-0.8: Modified compression (maximum 20 mmHg)
ABI less than 0.5: NO compression (contraindicated)
During healing: Compression bandages
After healing: Graded compression stockings to prevent recurrence

Compression Stocking Classes:

Class I (20-30 mmHg): Mild edema, varicose veins
Class II (30-40 mmHg): Moderate edema and venous disease
Class III (40-50 mmHg): Severe edema, severe venous disease, lymphedema
Class IV (50-60 mmHg): Lymphedema

Step 7 - Additional treatments: Pentoxifylline 400-800 mg three times daily (improves healing by 50%), doxycycline (antiinflammatory), vitamins C and E + zinc, flavonoids, low-molecular-weight heparin, sulodexide

Difficult/non-healing cases: Skin grafts, bioengineered skin, growth factors, electrostimulation, negative pressure wound therapy

CHAPTER 4: CONTACT DERMATITIS & PATCH TESTING

6. IRRITANT vs. ALLERGIC CONTACT DERMATITIS

IRRITANT CONTACT DERMATITIS:

Who gets it: Everyone (no genetic predisposition needed)
Mechanism: Nonimmunologic; physical and chemical alteration of epidermis
Number of exposures: Few to many (depends on individual's barrier integrity)
Nature of substance: Organic solvents, alkaline soaps
Concentration required: Usually high
Onset: Usually gradual as epidermal barrier becomes compromised
Distribution: Borders usually indistinct; confined to area of contact
Diagnosis: Trial of avoidance
Management: Protection and reduced exposure

ALLERGIC CONTACT DERMATITIS:

Who gets it: Only genetically predisposed individuals
Mechanism: Delayed hypersensitivity (Type IV); T-cell mediated
Number of exposures: One or several to cause sensitization; then rapid (12-48 hours) on re-exposure
Nature of substance: Low-molecular-weight hapten (metals, formalin, epoxy resins)
Concentration required: May be very low
Onset: 12-48 hours after re-exposure once sensitized
Distribution: May correspond exactly to contactant (watchband, elastic waistband); may spread beyond
Diagnosis: Trial of avoidance + patch testing
Management: Complete avoidance of allergen

Management of Irritant Contact Dermatitis:

Avoid exposure to irritants using protective equipment (gloves)
Topical steroids for initial inflammation control (some experts say avoid; may compromise barrier)
Moisturizers used generously and frequently (lipid-rich moisturizers both prevent and treat)
Barrier creams containing dimethicone or perfluoropolyethers; cotton liners
Cool compresses for acute inflammation; suppress vesiculation and decrease inflammation
Wash hands in cool or tepid water only
Repeated low-level UV exposures may be effective for long-term resistant cases
Barrier function takes approximately 4 months or more to normalize even after skin appears normal

7. RHUS DERMATITIS (POISON IVY / POISON OAK / POISON SUMAC)

Most common cause of allergic contact dermatitis in the United States
Allergen: URUSHIOL (resinous sap; mixture of catechols)
Found in all parts of the plant including roots and stems in fall and winter
Hallmark sign: LINEAR vesicular eruption (plant or oleoresin dragged across skin during scratching)
Blister fluid does NOT contain oleoresin and CANNOT spread the inflammation (common myth)

Cross-reacts with: Cashew nut shells (cashew nut oil is chemically related to urushiol), mango trees, Japanese lacquer trees, ginkgo

Clinical presentation:

Appearance varies with quantity of oleoresin contact
Small amounts: erythema only
Large amounts: intense vesiculation
Eruption appears 8 hours to 1 week after contact
Later-appearing lesions are NOT from spreading blisters - they are from smaller amounts of allergen that are slower to evolve

Prevention:

Washing with any type of soap inactivates and removes all surface oleoresin
Within 10 minutes: ALL oleoresin can be removed
After 10 minutes: Only 50% can be removed
After 30 minutes: Only 10% can be removed
After 60 minutes: None can be removed (too late)
IvyBlock (5% quaternium-18 bentonite lotion): Prevents dermatitis in more than 50% of sensitized patients

Treatment:

MILD (erythema only):

Cool wet compresses 15-30 min, several times daily for 1-3 days
Topical steroids Group I-V creams or gels, applied 2-4 times daily
Calamine lotion (controls itch but prolonged use causes drying)
Hydroxyzine and diphenhydramine for itch and sleep

SEVERE (widespread blistering):

Prednisone: 60 mg/day on days 1-4, then taper every 2 days by 10 mg, over 14 days total
Alternative: 20 mg twice daily for at least 7 days; tapering after this short course is usually NOT necessary
Non-compliant patients: Triamcinolone acetonide 40 mg intramuscularly
AVOID commercially available steroid dose packs (Medrol Dosepak) - they provide inadequate medication and cause rebound dermatitis

Diagnosis: Usually obvious. Patch testing is NOT done (high risk of inducing sensitization).

8. NATURAL RUBBER LATEX (NRL) ALLERGY

High-risk groups: Healthcare workers, rubber industry workers, persons with multiple surgeries

Three Types of Reactions:

TYPE 1 - IRRITANT CONTACT DERMATITIS:

Mechanism: Nonimmune; caused by moisture, heat, and friction under gloves
Presentation: Eczema under gloves
Treatment: Change gloves type; cool air dry hands

TYPE 2 - ALLERGIC CONTACT DERMATITIS (Type IV):

Mechanism: T-cell mediated; allergens are rubber accelerators - thiurams (72%), carbamates (25%), mercapto compounds (3%)
Presentation: Eczema limited to direct contact area (back of hand)
Diagnosis: Patch testing
Treatment: Identify allergen by patch testing; use alternative rubber articles without those chemicals; Elastyren or Tactylon hypoallergenic surgical gloves for surgeons

TYPE 3 - IMMEDIATE HYPERSENSITIVITY (Type I, IgE-mediated):

Mechanism: IgE-mediated; allergens are latex PROTEINS (not rubber chemicals)
Presentation: Contact urticaria; inhalation causes rhinitis, conjunctivitis, asthma; intraoperative anaphylaxis and death possible
Cross-reacts with foods: Banana, avocado, tomato, kiwi
Diagnosis: RAST test first; if negative, supervised "use test" with one glove finger, then whole hand; if still negative, skin-prick test (have life support available)
Treatment: Nonlatex alternatives; latex-safe hospital environment; powder-free low-allergen gloves for other healthcare workers at the same site

9. SHOE ALLERGY

Look: Subacute eczema over dorsa of feet; interdigital spaces are SPARED (unlike tinea pedis which involves interdigital spaces)
Usually bilateral; pale red and chapped rather than bright red
Most common allergens: Rubber/mercaptobenzothiazole (most common), chromate (leather tanning), p-tert-butylphenol formaldehyde resin (shoe glue)
These chemicals are leached out by sweat

Diagnosis: Patch testing required. Cut a 1-inch square piece from the shoe, separate glued layers, moisten each layer, and apply to upper outer arm.

Treatment:

Control perspiration: Aluminum chloride hexahydrate 20% (Drysol) applied at bedtime
Change socks at least once daily
Insert barrier insoles (Dr. Scholl's Air Foam Pads)
Most vinyl shoes are safe substitutes for rubber-sensitive and chrome-sensitive patients

10. METAL DERMATITIS

NICKEL

Number 1 cause of allergic contact dermatitis worldwide
Women affected much more frequently than men (men usually sensitized industrially)
Ear piercing is the most common cause of sensitization
Classic sites: Earlobes (earrings), wrist (watchband), abdomen (belt buckle), fingers (rings)
Sources: Jewelry, jean buttons and zippers, scissors, door handles, watchbands, bracelets, belt buckles, keys, hair curlers, coined money (cashiers at risk)

Low-Nickel Diet (for pompholyx or hand eczema in nickel-sensitive patients):

AVOID (HIGH NICKEL): Dark chocolate, cocoa powder, licorice, hazel nuts, almonds, peanuts, walnuts, pistachios, brown beans, soybeans, chickpeas, oatmeal, wheat bran, oat bran, mussels, oysters, shellfish, herring, all canned foods

ALLOWED (LOW NICKEL): All meats, poultry, eggs, milk, yogurt, butter, cheese, polished rice, refined wheat flour, potatoes, cabbage, carrots, cucumbers, lettuce, most fresh fruits (except pears), coffee, wine, beer

COOKING TIP: Do not cook acidic foods in stainless-steel utensils (nickel leaches out)

Baboon Syndrome: Systemic nickel ingestion in sensitized person → symmetric eczema on elbows, axillae, eyelids, sides of neck + bright red anogenital lesions (resembles baboon's red gluteal region)

CHROMATES

Most common sensitizer in men in industrialized countries
Sources: Cement (most common cause), leather gloves, shoes, photographic processes, metal, dyes
Cement acts both as an irritant (strong alkali, pH 12 → chemical burns) and as a sensitizer
Deep burns occur when cement spills over boot tops and is held against skin
Workers sensitized to cement chromates develop eczema on backs of hands and forearms that does not respond to steroids until removed from cement exposure

MERCURY

Mercury in dental amalgam (fillings) does NOT contain nickel
Allergy to mercury is very rare; patch testing unreliable and rarely done

11. PATCH TESTING

When to use: Suspected contact dermatitis, persistent or recurring eczema unresponsive to standard treatment, unusual eczema, to confirm allergic vs. irritant

T.R.U.E. TEST: 36 allergens in 3 panels applied to the back for 48 hours; detects up to 80% of common allergic contact dermatitis

Reading times:

First reading: 48 hours after application
Second reading: 3-7 days after application (important - delayed reactions common especially with neomycin, which may not appear until day 7)
Extended reading at day 6-7 is recommended especially for older women

Grading:

(+): Weak positive - erythema, infiltration, possibly papules (nonvesicular)
(++): Strong positive - edema or vesicular reaction
(+++): Extreme positive - spreading, bullous, or ulcerative reaction
IR: Irritant reaction (deep erythema like a burn) - NOT a positive allergy test
NT: Not tested

Strong ALLERGIC reactions: Vesicular; may spread beyond test site Strong IRRITANT reactions: Deep erythema resembling a burn; does NOT spread

When NOT to patch test:

Active, flaring dermatitis covering more than 25% of body surface area ("angry back syndrome" = many false positives)
Patient recently treated with systemic corticosteroids (wait at least 2 weeks)
After PUVA or UV phototherapy (wait 1-2 weeks)
Prednisone 15 mg/day or more may inhibit patch test reactions

Top 15 Allergens (North American Contact Dermatitis Group 2013-2014):

Nickel sulfate (20.1%)
Fragrance mix (11.9%)
Methylisothiazolinone (10.9%)
Neomycin (8.4%)
Bacitracin (7.4%)
Cobalt chloride (7.4%)
Myroxylon pereirae/Balsam of Peru (7.2%)
p-Phenylenediamine (7.0%)
Formaldehyde (7.0%)
MCI/MI - Cl+Me-isothiazolinone (6.4%)

CHAPTER 5: ATOPIC DERMATITIS (AD)

12. ATOPIC DERMATITIS - OVERVIEW

Chronic, pruritic, relapsing inflammatory skin disease
Most common in children; affects 15-25% of children and 7.2% of adults in the USA
The increase in prevalence is thought to be due to changes in microbe exposure during infancy and childhood
45% of AD begins in first 6 months of life; 85% begins before age 5
Associated with elevated serum IgE levels and personal or family history of hay fever, asthma, very dry skin
Atopic eczema is synonymous with AD

Atopic Triad: EAR = Eczema + Asthma + allergic Rhinitis

Genetics:

Polygenic inheritance; 77% concordance in monozygotic twins vs 15% in dizygotic twins
Multiple genes interact with environment to determine incidence and course
Filaggrin (FLG) gene mutation is key - present in extrinsic AD

Intrinsic AD:

Normal IgE levels; no filaggrin mutations
Begins in adulthood
TH-17 and TH-22 immune activation

Extrinsic AD:

Elevated IgE, filaggrin mutations, early onset
TH-2 dominant immune response

Key Pathology: Filaggrin mutation → decreased skin barrier → reduced microbiome diversity → Staphylococcus aureus colonization (dominant clonal strains in severe disease) → TH-2 cytokine overexpression (IL-4, IL-5, IL-13) → reduced antimicrobial peptides → more S. aureus → more inflammation (vicious cycle)

Course and Prognosis:

More than 50% of young children with generalized AD develop asthma and allergic rhinitis by age 13
Up to 80% of children show improvement before age 8 but many continue into adulthood
58% of infants with AD still have inflammation 15-17 years later
Notion that children "outgrow" AD should be abandoned

Unfavorable prognostic factors (in order of importance):

Persistent dry or itchy skin in adult life
Widespread dermatitis in childhood
Associated allergic rhinitis
Family history of atopic dermatitis
Associated bronchial asthma
Female gender

13. CLINICAL PHASES OF AD

INFANT PHASE (Birth to 2 Years)

Infants rarely born with AD; typically develop first signs around the 3rd month of life
Most common: Red, scaling plaques on CHEEKS, SPARING perioral and paranasal areas
Chin often involved due to drooling and repeated washing
Habitual lip licking → oozing, crusting, scaling on lips and perioral skin
DIAPER AREA IS OFTEN SPARED (protected from scratching)
Scalp may be involved (can resemble seborrheic dermatitis)
Prolonged disease with discomfort disturbs sleep; both parents and child are distraught
Resolves in approximately 50% of infants by 18 months; others progress to childhood phase

CHILDHOOD PHASE (2 to 12 Years)

Most characteristic pattern: Inflammation in FLEXURAL AREAS
Antecubital and popliteal fossae, neck, wrists, and ankles
Perspiration from exertion → burning and intense itching in these areas → itch-scratch cycle
Tight clothing trapping heat makes it worse
Lichenification develops with repeated scratching
Constant scratching → destruction of melanocytes → areas of hypopigmentation (fade with time)
Most patients in remission by age 30; a few have lifelong disease

ADULT PHASE (12 Years to Adult)

Resurgence at puberty (possibly hormonal changes or stress)
Most common pattern: Localized lichenification
Common adult patterns:
1. Flexural inflammation (same as childhood)
2. Hand dermatitis (most common adult expression of atopic diathesis)
3. Inflammation around eyes/upper eyelids (patient rubs with back of hand)
4. Lichenification of anogenital area (vulva, scrotum, rectum - resistant to treatment; lasts for years)
Pigmentary alterations (hypopigmentation) may be distressing

14. DIAGNOSTIC FEATURES OF ATOPIC DERMATITIS

Essential (must be present):

Pruritus
Eczema with typical age-appropriate pattern:
- Infants: Facial, neck, and extensor involvement
- Children and adults: Flexural lesions
- Sparing of groin and axillary regions

Important supporting features:

Early age of onset
Atopy: personal or family history + IgE reactivity
Xerosis (dry skin)

Associated features (suggest but not diagnostic):

Atypical vascular responses (facial pallor, white dermographism)
Keratosis pilaris, ichthyosis vulgaris, hyperlinear palms
Ocular/periorbital changes
Dennie-Morgan infraorbital fold (extra line under lower eyelid)
Perifollicular accentuation, lichenification, prurigo lesions

Conditions to exclude: Scabies, seborrheic dermatitis, contact dermatitis (irritant or allergic), ichthyoses, cutaneous T-cell lymphoma, psoriasis, photosensitivity dermatoses, immune deficiency diseases

15. TRIGGERING FACTORS FOR AD

TEMPERATURE CHANGE AND SWEATING:

Atopic patients do not tolerate sudden temperature changes
Sweating induces itching particularly in antecubital and popliteal fossae
Lying under warm blankets, entering a warm room, physical stress all intensify desire to scratch
Hot showers temporarily relieve itching (pain better tolerated than itch) but heat aggravates eczema
Discourage heat-trapping clothing

DECREASED HUMIDITY (Fall and Winter):

Cold air cannot hold much humidity; skin loses moisture
Dry skin is less supple, more fragile, more easily irritated
Pruritus is established, rash appears
Commercial humidifiers can help (target greater than 50% humidity)

EXCESSIVE WASHING:

Repeated washing removes water-binding lipids from stratum corneum
Daily baths tolerated in summer but lead to excessive dryness in fall and winter
Apply moisturizer WITHIN 3 MINUTES of bath to retain hydration

CONTACT WITH IRRITATING SUBSTANCES:

Wool, household and industrial chemicals, cosmetics, soaps, detergents
Cigarette smoke may provoke eczematous lesions on eyelids
Atopic patients have lower threshold for irritant response

STAPHYLOCOCCUS AUREUS:

Predominant skin microorganism in AD lesions
Significantly increased even on non-affected skin
Normally represents less than 5% of total skin microflora in persons without AD
Antibiotics given systemically or topically may dramatically improve AD

AEROALLERGENS:

House-dust mite is the most important aeroallergen
Positive patch test rates: House dust 70%, mites 70%, cockroaches 63%, mold mix 50%, grass mix 43%
Avoidance of aeroallergens rarely improves dermatitis significantly

FOOD:

Consider food allergy in infants, young children, and selected older children with moderate to severe AD
Most common offenders in children: Eggs, peanuts, milk, fish, soy, wheat (top 5 account for 90% of reactions)
May cause urticaria, exacerbation of eczema, GI symptoms, or anaphylaxis

EMOTIONAL STRESS:

Can trigger sudden widespread flare almost overnight
AD is WORSENED by (not caused by) emotional stress
Is an inherited genetic disease; explain this to patients who feel responsible for their disease

16. ASSOCIATED FEATURES OF AD

XEROSIS (DRY SKIN):

Most common associated feature; itchy; worse in winter
Dry skin → itching → eczema
Avoid frequent washing; use mild soaps (Dove, Cetaphil); apply moisturizing creams or lotions
Moisturizers most effective applied shortly after patting skin dry following bathing

ICHTHYOSIS VULGARIS:

Disorder of keratinization; dry rectangular scales
Dominant ichthyosis vulgaris is significantly associated with atopy
White translucent scales on extensor aspects of arms and legs; improves with age
Does NOT encroach on axillae and fossae
Treatment: 12% ammonium lactate lotion/cream or urea cream (very effective)

KERATOSIS PILARIS:

Very common; occurs more often and more extensively in AD patients
Small (1-2 mm) rough follicular papules or pustules
Posterolateral aspects of upper arms and anterior thighs most common; any area except palms and soles
Peaks during adolescence; tends to improve thereafter
May look like acne on the face (uniform small size differentiates from acne)
Treatment: 12% ammonium lactate (Lac-Hydrin, AmLactin), urea cream (10-40%), salicylic acid 6% lotion
Group V topical steroids for temporary redness reduction before important events

HYPERLINEAR PALMAR CREASES:

Accentuated major skin creases of palms; more prominent with age and disease severity
May be initiated by rubbing or scratching
Moisturizers soften skin but do not improve the creases

PITYRIASIS ALBA:

Hypopigmented, slightly elevated, fine scaling plaques with indistinct borders
Affects face, lateral upper arms, thighs; common in children; usually disappears by early adulthood
White round-to-oval areas 2-4 cm; become obvious in summer (areas do not tan)
Loss of pigment is NOT permanent (unlike vitiligo)
Treatment: No treatment needed unless eczematous; tacrolimus ointment 0.1% twice daily for a few weeks may be effective

OCULAR COMPLICATIONS:

Cataracts: 1-25% prevalence; associated with chronic systemic steroid use
Annual ophthalmologic screening recommended in chronic AD patients receiving systemic steroids
Patients applying topical steroids to eyelids for more than 4 weeks should have intraocular pressure measured

17. TREATMENT OF ATOPIC DERMATITIS (Step-by-Step)

STEP 1: DRY SKIN CONTROL

Daily bath: Apply moisturizer WITHIN 3 MINUTES of bath (before water evaporates) = "soak and smear"
Pat skin dry gently before applying moisturizer to seal in moisture
Use unscented petrolatum or cream (NOT lotion - less effective)
Use mild soaps sparingly in axilla, groin, and feet only
Humidify home in winter (target greater than 50% humidity)
Avoid wool; use 100% cotton clothing
Avoid fabric softeners, perfumes or makeup that burns or itches
Maintain cool, stable temperatures; do not overdress

STEP 2: TOPICAL ANTI-INFLAMMATORY THERAPY

TOPICAL CORTICOSTEROIDS (TCS) - FIRST-LINE:

Apply 2 weeks on, then rest 1 week, then restart
Do NOT start with hydrocortisone or weak steroids - inflammation persists and patients lose confidence
Use MID-TO-HIGH strength steroids initially for rapid control (within days)
Apply ointment-based medications for dry skin
Face and eyelids: Use Group V-VI (weak steroids like desonide) OR calcineurin inhibitors
Lichenified plaques in adults: Group I-II + occlusion for 10-14 days
Maintenance: Fluticasone ointment once daily on weekends to maintain improvements and delay relapse

PIMECROLIMUS (ELIDEL) 1% CREAM - Topical calcineurin inhibitor:

Indicated: Short-term and intermittent long-term therapy for MILD TO MODERATE AD, age 2 and older
Apply twice daily to affected skin
Can be used on ALL skin surfaces including face, neck, intertriginous areas
Stop when eczema clears or if no improvement after 6 weeks
DO NOT use with occlusive dressings
Absorbed at lower rate than tacrolimus; lower potential for systemic absorption
Side effects: Burning and stinging (usually mild)
FDA black-box warning: Avoid prolonged continuous use; avoid excessive UV exposure (tanning beds or UV treatment)
"Prevention of flare" strategy: Early treatment at first signs of recurrence reduces flares requiring topical steroids

TACROLIMUS (PROTOPIC) OINTMENT - Topical calcineurin inhibitor:

Indicated: Short-term and intermittent long-term therapy for MODERATE TO SEVERE AD
0.03% for children 2-15 years
0.1% for adults (and children in some countries)
Apply twice daily; continue 1 week after clearing; do NOT use under occlusive dressings
Efficacy similar to mid-potency steroid such as betamethasone valerate 0.12%
SAFE on face and around eyes: Does NOT cause atrophy or pigmentary alterations; no increased IOP when applied to eyelids
Systemic absorption is minimal even with large area treatment
Side effects: Burning at application site (31-61% of patients); lasts 2 minutes to 3 hours; decreases after first few days
FDA black-box warning: Avoid prolonged continuous use; avoid excessive UV/tanning bed exposure
"Proactive strategy": Twice-weekly application prevents and delays AD exacerbations

CRISABOROLE (EUCRISA) 2% OINTMENT - PDE-4 inhibitor:

Indicated: Mild to moderate AD in patients 2 years and older
Apply twice daily to affected areas
Improves severity scores and decreases pruritus
Side effect: Pain at application site (most common)
Co-administration with Group V or VI topical steroid can help with application site pain

STEP 3: TREAT INFECTION

BLEACH BATHS:

Quarter to half a cup of household bleach (sodium hypochlorite) in full adult bathtub
Effective as both antiinflammatory and antiinfective agent
Can be done daily or as infrequently as weekly depending on disease severity
Hypochlorous acid spray (Alevicyn) can be applied once to twice daily for pruritus and infected wounds

ANTIBIOTICS:

Staphylococcus aureus colonizes eczematous lesions and worsens AD
START oral antibiotics 2 DAYS BEFORE initiating topical steroid treatment
Cephalexin (Keflex) or Cefadroxil (Duricef) are first choices
Dicloxacillin is an alternative
Oral antibiotics are more effective than topical antibiotics

INTRANASAL MUPIROCIN:

Used in patients with recurrent infections to reduce nasal carriage of S. aureus

STEP 4: CONTROL ITCHING

ORAL ANTIHISTAMINES:

Hydroxyzine: Sedating; most useful at bedtime to help patient sleep and suppress unconscious scratching
Important note: Antihistamines have only MARGINAL therapeutic benefit for AD itself; they do NOT alter the course of the disease
Nonsedating antihistamines have NO objective evidence of effectiveness for AD pruritus

TOPICAL ANTIHISTAMINES:

Doxepin HCl cream 5% (Zonalon): Short-term (up to 8 days) management of pruritus in AD and LSC; apply 4 times daily with 3-hour intervals
Drowsiness occurs in more than 20% (especially over large body surface areas)
Side effects: Burning and stinging at application site

STEP 5: PHOTOTHERAPY

Effective for mild, moderate, and severe AD
Narrowband UVB 311 nm: Effective as monotherapy for moderate to severe AD; doses considerably lower than for psoriasis
UVA1 (340-400 nm): Superior to conventional UVA-UVB for SEVERE AD
Combined UVA-UVB: Also effective
PUVA (psoralen + UVA): Effective but many clinicians avoid due to long-term carcinogenicity risk
Low-dose UVA1 or narrowband UVB twice weekly for 4 weeks then once weekly for 4 more weeks appears to prevent relapse

STEP 6: SYSTEMIC IMMUNOSUPPRESSIVE AGENTS (Severe, Refractory AD)

Consider when patient has severe AD that has failed topical regimens and phototherapy.

CYCLOSPORINE A (CsA):

Most commonly used systemic agent for severe refractory AD
Inhibits T cells and cytokine gene expression
Effective and well-tolerated in both children and adults
Starting dose: 2.5 mg/kg/day (low dose preferred for safety); can go up to 5 mg/kg/day for severe disease
Short-term preferred; long-term (up to 1 year) only in exceptional cases
Disease may relapse despite treatment or recur soon after stopping

METHOTREXATE:

Inhibits folic acid and impairs DNA synthesis
Administered weekly (orally, subcutaneously, or intramuscularly): 7-25 mg weekly
ALWAYS give folic acid supplementation (5 mg 24 hours after methotrexate, or 1 mg daily) to reduce side effects

AZATHIOPRINE:

Purine analog; suppresses B cells and T cells
Effective for severe AD
Check THIOPURINE METHYLTRANSFERASE (TPMT) level BEFORE starting to determine safe dosing

MYCOPHENOLATE MOFETIL (MMF):

Impairs purine synthesis; selectively affects B cells and T cells
Highly effective for moderate to severe AD
No serious adverse effects
Administered orally 500 mg to 1 g twice daily

ORAL CORTICOSTEROIDS:

Should NOT be routinely used for AD
Use ONLY for severe unresponsive AD as a bridge therapy or when immediate relief is required
High relapse rate after stopping; rebound flare possible
Commercially available steroid dose packs (Medrol Dosepak) provide inadequate medicine - AVOID
Risk of atopic cataracts with systemic steroid therapy

STEP 7: BIOLOGIC THERAPY

DUPILUMAB (DUPIXENT):

Mechanism: Human monoclonal antibody (IgG4) that binds to IL-4 receptor alpha subunit (IL-4Rα) and inhibits BOTH IL-4 AND IL-13 signaling, including release of proinflammatory cytokines, chemokines, and IgE
Indication: Moderate to severe AD in adults and adolescents whose disease is not adequately controlled with topical therapies
Dosing: Initial 600 mg subcutaneous injection, then 300 mg every other week (adults and adolescents ≥18 years or 12-17 years weighing ≥60 kg); 400 mg initial then 200 mg every other week for 12-17 years weighing less than 60 kg
Side effects: Conjunctivitis occurs in approximately 16% of patients; may lead to discontinuation; refer to ophthalmology if patient does not respond to topical over-the-counter measures
AVOID live vaccines while on dupilumab

HOSPITALIZATION FOR SEVERELY RESISTANT CASES

Short hospital stay rapidly controls condition that has had prolonged, unstable course
Mean treatment time is 3.6 days
Intensive topical treatments with wet dressings over topical corticosteroids in hospital setting

Home Hospitalization Protocol (weekend treatment):

Designate family member as nurse; complete bed rest with bathroom privileges
Cotton bedclothes; dust-free, animal-free room; temperature 68-70°F; humidity 70%
Tepid tub bath with bath oil twice daily; emollient applied to moist body after bath
Body lesions: Group II-V topical steroid cream or ointment twice daily ± vinyl suit occlusion 2-8 hours
Face: Group V steroid cream or ointment twice daily
Scalp: Daily shampoo + topical steroid lotion
Systemic: Oral antibiotics (cephalexin or dicloxacillin) + sedating antihistamines (hydroxyzine 10-25 mg four times daily, or doxepin 10-25 mg four times daily)

18. FOOD ALLERGY IN ATOPIC DERMATITIS

Testing recommended for: Infants and young children with moderate to severe AD; selected older children with clinical history suggesting food allergy.

Common food allergens:

Young children: Cow's milk, hen's eggs, peanuts, tree nuts, sesame seeds, wheat, soy
Adults: Shellfish, fish, peanuts, tree nuts
More than 90% of reactions in young children are caused by only 5 foods: Eggs, milk, peanuts, soy, and wheat

Testing approach:

Skin prick test (SPT): Sensitivity 90%, specificity 50%; cannot diagnose FA alone
IgE testing: High sensitivity but low specificity; many false positives
Oral food challenge: Gold standard for confirming food allergy or tolerance
Do NOT do broad food elimination based solely on positive IgE (low specificity; risk of nutritional deficiencies)
4 to 6 week targeted food elimination diet may be tried if specific allergen suspected

Natural history of common food allergies:

Hen's egg: Resolves in 75% by age 7 years
Cow's milk: Resolves in 76% by age 5 years
Wheat: Resolves in 80% by age 5 years
Soy: Resolves in 67% by age 2 years
Peanuts: Persistent; only 20% resolve by age 5
Tree nuts: Persistent; only 9% resolve after age 5
Fish and shellfish: Usually persistent
Sesame: Persistent; 20% resolve by age 7

PEANUT ALLERGY PREVENTION (current guidelines):

Infants with severe eczema or egg allergy: Consider evaluation and introduce peanuts at 4-6 months after testing
Infants with mild to moderate eczema: Introduce peanut-containing foods around 6 months
Infants with no eczema or food allergy: Introduce peanuts at age-appropriate time per family preference
Early introduction and regular consumption of peanuts DECREASES the development of peanut allergy

19. HIGH-YIELD CLINICAL PEARLS

Topical steroid creams should NEVER be applied directly onto ulcers - it stops the healing process.
Wet compresses in asteatotic eczema: Use for MAXIMUM 1-2 days only; prolonged use causes excessive drying.
Medrol Dosepak (steroid dose packs) are INADEQUATE for poison ivy or severe AD - they cause rebound dermatitis.
In hand eczema, ALWAYS consider patch testing even if the pattern looks like irritant dermatitis.
Adult-onset recalcitrant eczema with no clear cause - rule out cutaneous T-cell lymphoma.
Tacrolimus (Protopic) is SAFE on the face and around eyes; no skin atrophy unlike topical steroids.
In stasis dermatitis, AVOID neomycin, parabens, lanolin - very high sensitization risk in venous skin.
Generalized eczema or intractable pruritus in adults may be a sign of Hodgkin lymphoma.
Bleach baths reduce Staphylococcus aureus colonization effectively in atopic dermatitis.
Filaggrin mutation leads to weak skin barrier which leads to Staph colonization which leads to TH-2 dominant inflammation and worsened AD (the core cycle of disease).
In poison ivy: Washing within 10 minutes removes ALL urushiol; after 30 minutes only 10% removed; after 60 minutes nothing can be removed.
Pompholyx blister fluid does NOT spread the reaction (very common misconception among patients).
Patch test must be read at 48 hours AND again at 3-7 days. Neomycin reactions may not appear until day 7.
Before applying compression therapy for venous ulcers, ALWAYS check the Ankle-Brachial Index (ABI) first.
Dupilumab (Dupixent) blocks IL-4 and IL-13 simultaneously; watch for conjunctivitis in about 16% of patients.
Children do NOT simply outgrow atopic dermatitis - 58% of infants with AD still have inflammation 15-17 years later.
Pompholyx cause: 67.5% allergic (cosmetics and hygiene products most common, then metals), 10% mycosis, 15% idiopathic atopic - test with patch testing and consider a low-metal diet if metal-sensitive.
Stasis dermatitis: Brown skin discoloration is hemosiderin - iron remaining after RBCs leak out of veins due to increased hydrostatic pressure.
Start oral antibiotics 2 days BEFORE initiating topical steroid treatment in AD with infection.
Montelukast + fexofenadine combination is effective for prurigo nodularis; naltrexone also works but 41% relapse after stopping.

Notes from Habif's Clinical Dermatology - Chapters 3, 4, and 5. All treatments included; doses omitted as requested.

IF I LEARN THIS WILL IT BE ENOUGH FOR ORAL ASSESSMENTS?

Honestly, yes — and more than enough for most oral assessments on dermatitis. Here is a realistic breakdown:

What These Notes Cover (Very Well)

Clinically, the notes hit every topic an examiner typically asks about:

All 3 stages of eczema with causes and treatments
Every major hand eczema type with treatments
Pompholyx, fingertip eczema, hyperkeratotic eczema
Lichen simplex chronicus, prurigo nodularis (with full drug list)
Stasis dermatitis and venous ulcers (3 types compared)
Irritant vs. allergic contact dermatitis
Poison ivy treatment
Latex allergy (3 types)
Nickel allergy + low-nickel diet
Patch testing - when to do it, when NOT to, grading
Atopic dermatitis - full pathogenesis, 3 phases, all treatments including dupilumab

What You Should ADD for Oral Assessments

Oral examiners often test reasoning and clinical thinking, not just facts. A few gaps to be aware of:

1. Morphology descriptions in your own words Practice describing lesions out loud. For example:

"Lichenification is thickening of the epidermis with accentuated skin lines resembling a washboard, caused by chronic rubbing or scratching."
"Vesicles are small serum-filled blisters less than 5 mm."

2. Differential diagnosis thinking Know how to distinguish similar-looking conditions:

Eczema vs. Psoriasis: Psoriasis has sharp borders, deeper red, silvery scale; eczema has indistinct borders
Pompholyx vs. Pustular psoriasis: Pompholyx vesicles are clear and resolve quickly; psoriasis vesicles rapidly become purulent and are chronic
Shoe allergy vs. Tinea pedis: Shoe allergy spares interdigital spaces; tinea principally involves them
Pityriasis alba vs. Vitiligo vs. Tinea versicolor: Vitiligo has distinct sharp border; tinea versicolor has KOH-positive fungal elements; pityriasis alba has indistinct borders

3. Pathophysiology in simple language Be ready to explain:

Why filaggrin mutation causes AD (broken barrier → Staph in → TH-2 dominance → more inflammation)
Why venous ulcers form (venous hypertension → fibrin cuffs → poor oxygenation → skin infarction)
Why allergic contact dermatitis takes 12-48 hours (sensitization already happened; re-exposure triggers T-cell cascade)

4. "What would you do next?" questions Oral exams love management scenarios:

Patient with hand eczema not responding to topical steroids → "I would consider patch testing to rule out allergic contact dermatitis"
Adult with new-onset generalized eczema, no obvious trigger → "Rule out cutaneous T-cell lymphoma / Hodgkin lymphoma"
Stasis ulcer not healing → "Check ABI before compression; ensure no steroid applied directly on ulcer; consider pentoxifylline"

5. One or two drug mechanisms to mention

Tacrolimus and pimecrolimus: "Calcineurin inhibitors - block T cell activation and prevent cytokine release; do not cause skin atrophy"
Dupilumab: "Monoclonal antibody blocking IL-4 and IL-13 signaling - the key TH-2 cytokines driving atopic dermatitis"
Crisaborole: "PDE-4 inhibitor - increases cAMP - inhibits NF-κB - decreases TNF-alpha and proinflammatory cytokines"

What Oral Examiners Love to Catch People On

These are classic "trip-up" questions - your notes already cover the answers:

"Can blister fluid from poison ivy spread the reaction?" - NO
"Can you use steroid cream on a venous ulcer?" - NO, it stops healing
"When is compression therapy contraindicated?" - ABI less than 0.5
"Why not use a Medrol Dosepak for poison ivy?" - Inadequate dose; causes rebound
"Is AD caused by emotional stress?" - No, stress WORSENS it; it is a genetic disease
"Do children outgrow AD?" - Not reliably; 58% still have it 15-17 years later
"What is the most common cause of allergic contact dermatitis worldwide?" - Nickel
"What is the cornerstone of venous ulcer treatment?" - Compression therapy

Bottom Line

Your notes cover 90-95% of what gets asked in a dermatology oral on this topic. The remaining 5-10% is just practicing how you SPEAK about it - describing lesions, walking through a differential, and explaining your management reasoning step by step.

The single most important thing for oral success beyond knowing the content is practice saying it out loud. Read through the notes once, close them, and try to talk through each disease as if a professor just asked you about it.

NEXT DO SYPHILIS DONT MISS ANY POINT

Running Command

python3 -c " import pdfplumber with pdfplumber.open('/home/daytona/workspace/attachments/7221c298-405b-4c36-ac0e-91fa10d6b3fa/BACTERIAL STI.pdf') as pdf: print(f'Total pages: {len(pdf.pages)}') for i, page in enumerate(pdf.pages): text = page.extract_text() print(f'--- PAGE {i+1} ---') print(text) print() "

These notes cover every point from the syphilis section of your BACTERIAL STI.pdf. Here's what's included:

All 20 sections covered:

Overview & transmission routes
T. pallidum organism biology (replication time, why it matters for treatment duration)
Incidence & epidemiology (with 2016 stats)
Complete staging system (CDC definitions)
Risk of transmission (10-60%, as few as 10 organisms)
Primary syphilis - full chancre description + differential
Secondary syphilis - all lesion types, locations, polymorphism, relapse data
Latent syphilis - early vs. late criteria
Tertiary syphilis - all manifestations with onset timelines
Syphilis + HIV interaction
Congenital syphilis - outcomes, treatment timing, early vs. late signs
Full serology section - all tests (NTT, TT, direct methods), sensitivity table, prozone, serofast, false positives, conventional vs. reverse algorithm
Staging diagnostic criteria table
All treatments (CDC + WHO, with doses)
Penicillin allergy management
Jarisch-Herxheimer reaction
Post-treatment follow-up schedule
Genital ulcer differential table
Quick recall tables
20 oral exam high-yield points

CAN YOU MAKE ME A SORT OF CHEAT SHEET FOR ALL DISEASES WE HAVE COVERED EXCEPT SYPHILIS, CONVERING MAYBE CLINICAL FINDINGS, LESIONS AND TREATMENT[WITHOUT DOSES] MAKING IT EASY FOR ME TO LEARN , MAYBE SOME TRICKS TO REMEMBER

Based on everything we've covered (Dermatitis notes + Bacterial STI notes excluding Syphilis), here's your cheat sheet:

🗒️ MASTER CHEAT SHEET

Dermatitis + Bacterial STIs (Excluding Syphilis)

PART 1: BACTERIAL STIs

🔴 GENITAL ULCER DISEASES - MASTER COMPARISON TABLE

Feature	CHANCROID	LGV	DONOVANOSIS	HERPES
Organism	H. ducreyi	C. trachomatis (L1,L2,L3)	Klebsiella granulomatis	HSV-1/HSV-2
Ulcer	Painful, soft, purulent base, bleeds easily, undermined edges	Small, painless erosion - heals fast, rarely seen	Painless, beefy-red, raised, friable, "rolled margin"	Vesicles → painful ulcers
Number	Multiple	Usually 1	Single or multiple, spreads contiguously	Multiple
Lymph nodes	Tender, unilateral, fluctuant BUBOES	"Groove sign" (nodes above AND below inguinal ligament)	NOT associated with lymphadenopathy	Tender bilateral inguinal
Treatment	Azithromycin OR Ceftriaxone OR Ciprofloxacin OR Erythromycin	Doxycycline (21 days) OR Erythromycin	Azithromycin OR Doxycycline OR Ciprofloxacin OR Erythromycin OR TMP-SMX	Acyclovir / Famciclovir / Valacyclovir

🧠 MEMORY TRICKS - Genital Ulcers:

"Soft HURTS, Hard DOESN'T"

Soft chancre (chancroid) = PAINFUL 🔴

Hard chancre (syphilis) = PAINLESS

"DONOVAN'S BEEF STEAK" → Donovanosis = beefy-red ulcer

"LGV GROOVES you" → LGV = Groove sign (pathognomonic)

"LGV takes LONG" → 21 days of doxycycline (longest course)

Chancroid = SCHOOL OF FISH → H. ducreyi appears as Gram-negative coccobacilli in parallel arrays ("school of fish" pattern on Gram stain)

Donovan BODIES in HISTIOCYTES → "closed safety pin" appearance

🟠 URETHRITIS/CERVICITIS

Gonorrhea vs. Non-Gonococcal Urethritis (NGU)

Feature	GONORRHEA	NGU
Organism	Neisseria gonorrhoeae	C. trachomatis (15-40%), M. genitalium, T. vaginalis, adenovirus
Incubation	3-5 days	7-28 days
Onset	Abrupt	Gradual
Dysuria	Burning	Smarting
Discharge	Purulent, thick, yellow	Mucoid or purulent
Gram stain	Gram-negative intracellular diplococci (GNID)	PMNs only (no GNID)
Treatment	Ceftriaxone IM + Azithromycin	Azithromycin OR Doxycycline

🧠 MEMORY TRICKS - Urethritis:

"Gonorrhea is QUICK and OBVIOUS" → Short incubation (3-5 days), abrupt onset, burning, pus pouring out

"NGU is SLOW and SUBTLE" → Long incubation (7-28 days), gradual, smarting, mucoid

"GNID = Gonorrhea" → Gram-Negative Intracellular Diplococci = pathognomonic for gonorrhea on Gram stain

Always treat gonorrhea with TWO drugs (ceftriaxone + azithromycin) because dual coverage prevents resistance

🟡 DISSEMINATED GONOCOCCAL INFECTION (DGI)

Classic Triad:

Dermatitis - <10 lesions; papules → vesicles → pustules → necrotic/hemorrhagic center; on extensor surfaces
Tenosynovitis - hands, fingers, wrists
Migratory polyarthritis

Two presentations:

60%: Bacteremic stage - fever, rash, tenosynovitis (blood culture positive, joint culture negative)
40%: Septic arthritis - hot, painful, swollen joints; usually 1-2 large joints (knee most common) (joint culture positive)

"DGI = Dirty, Goes Inside" → Disseminated, Gets Into joints/skin/blood

Male:Female ratio = 1:4 → Women more affected because asymptomatic genital infection remains untreated

🟢 PELVIC INFLAMMATORY DISEASE (PID)

Organisms: C. trachomatis and/or N. gonorrhoeae (also anaerobes, Gardnerella, H. influenzae)

CDC Minimum Criteria (ALL THREE required):

Lower abdominal tenderness
Adnexal tenderness
Cervical motion tenderness ("chandelier sign")

Additional supporting criteria: Fever >38.3°C, abnormal discharge, elevated ESR/CRP, positive N. gonorrhoeae or C. trachomatis

Complications: Tubal scarring → infertility / ectopic pregnancy

Treatment:

Outpatient: Ceftriaxone IM + Doxycycline ± Metronidazole (×14 days)
Inpatient: Cefotetan/Cefoxitin IV + Doxycycline OR Clindamycin IV + Gentamicin

"PID = Pain In the Downstairs" → CMT + adnexal + lower abdominal tenderness

🔵 LYMPHOGRANULOMA VENEREUM (LGV)

3 Stages:

Stage	Features
Primary	Small painless papule/erosion on genitals - heals in 1 week without scarring - often missed
Inguinal	Buboes + headache/fever/myalgia; GROOVE SIGN (pathognomonic) in 1/5 patients
Genitoanorectal	Proctocolitis, fistulas, strictures, elephantiasis of labia, "saxophone penis" in males

Groove Sign: Enlargement of inguinal nodes ABOVE and femoral nodes BELOW the Poupart (inguinal) ligament → creates a groove

Treatment: Doxycycline 21 days (or Erythromycin 21 days)

DO NOT incise/drain buboes → delays healing; aspirate through healthy skin instead

"LGV = 3 Groovy Stages" → Primary (easily missed) → Groove sign → Genito-rectal destruction

⚫ CHANCROID

Caused by: Haemophilus ducreyi - Gram-negative rod

Clinical:

Incubation 4-10 days
Painful red papule → pustule → deep, ragged, irregular ulcer with red halo
Soft (not indurated like syphilis)
Bleeds easily; burrowing/undermined edges; yellow-gray exudate
Autoinoculation common → "kissing lesions"
~50% develop tender, unilateral inguinal lymphadenopathy (buboes that may rupture)

Gram stain: "School of fish" - parallel arrays of Gram-negative coccobacilli

Probable diagnosis criteria (ALL must be met):

One or more painful genital ulcers
No evidence of T. pallidum (dark field or serology at least 7 days after ulcer onset)
Negative HSV test on ulcer exudate
Clinical presentation typical for chancroid

Treatment: Azithromycin single dose OR Ceftriaxone single dose OR Ciprofloxacin 3 days OR Erythromycin 7 days

🟤 DONOVANOSIS (GRANULOMA INGUINALE)

Caused by: Klebsiella granulomatis - intracellular Gram-negative bacillus

Clinical:

Painless, broad, superficial ulcer with beefy-red, granulation tissue-like base
Distinct raised, rolled margin
Bleeds to touch
Spreads contiguously (no lymphadenopathy, unlike LGV/chancroid)
Autoinoculation = "kissing lesions"
Late complication: lymphatic obstruction → elephantiasis of genitals

Diagnosis: Donovan bodies - bipolar-staining intracytoplasmic inclusion bodies within histiocytes; "closed safety pin" appearance on Giemsa stain

Treatment: Azithromycin OR Doxycycline OR Ciprofloxacin OR Erythromycin OR TMP-SMX (minimum 3 weeks, until all lesions healed)

"DONOVAN'S SAFETY PIN in BEEF STEAK" = Donovan bodies (safety pin shape) in beefy-red ulcer

PART 2: DERMATITIS

📋 ECZEMA - THE 3 STAGES

Stage	Look	Feel
Acute	Vesicles, red, weeping, crusting	Intensely itchy
Subacute	Red/pink, scaling, crusting	Less itchy
Chronic	Thick, lichenified, fissured, dark	May itch less

"Wet → Scaly → Thick" = Acute → Subacute → Chronic

🖐️ HAND ECZEMA - ALL TYPES

Type	Key Feature	Trigger
Irritant Contact	Most common; fingertip dryness/fissures; no patch test reaction	Repeated wet work, soaps, solvents
Allergic Contact	Patch test POSITIVE; can spread beyond contact area	Allergens (nickel, rubber, etc.)
Atopic Hand	History of atopy; involves dorsal hands	Atopic background
Hyperkeratotic	Thick, fissured palms; MIDDLE-AGED MEN; no vesicles	Unknown; stress worsens
Pompholyx	Deep-seated vesicles on PALMS AND LATERAL FINGERS; intensely itchy	Stress, heat, sweating
Nummular	Round/coin-shaped plaques	Unknown
Fingertip	Dry, fissured fingertips only	Paper, musicians, gardeners
Ring	Under ring; from soap/moisture trapping	Trapped moisture

"POMPHOLYX POPS on PALMS" → Deep vesicles on palms/lateral fingers; intensely itchy

"HYPERKERATOTIC = HE (Middle-Aged Man)" → No vesicles, just thick cracked palms

💊 PRURIGO NODULARIS vs. NEUROTIC EXCORIATIONS vs. PSYCHOGENIC PARASITOSIS

Feature	Prurigo Nodularis	Neurotic Excoriations	Psychogenic Parasitosis
Lesion	Hard, dome-shaped nodules (PICKED)	Linear/angular excoriations	Excoriations + "matchbox sign"
Location	Extensor limbs, can't reach middle back	Reachable areas (spares mid-back)	Arms, legs, face
Key feature	"Butterfly sign" - clear mid-back	Angulated shapes (fingernail)	Patient brings specimens (matchbox sign)
Belief	"Itches"	"Can't stop picking"	Believes bugs/parasites are present
Treatment	Clobetasol, intralesional steroids, dupilumab, thalidomide, naltrexone	SSRIs, CBT, NAC	Pimozide / Risperidone

"Can't Reach = Butterfly" → Prurigo nodularis spares the mid-back (can't reach) = butterfly-shaped clear zone

"MATCHBOX SIGN = BUGS in the MIND" → Delusional parasitosis - brings specimens in matchbox/tape

🦵 STASIS DERMATITIS & VENOUS ULCERS

Stasis Dermatitis:

Caused by venous hypertension
Location: medial lower leg (above medial malleolus)
Red-brown pigmentation (hemosiderin), edema, lipodermatosclerosis
"Inverted champagne bottle leg"

Venous Ulcer Comparison:

Feature	Venous	Arterial	Neuropathic
Location	Medial ankle/gaiter area	Lateral ankle, tips of toes	Pressure points (heel, metatarsal heads)
Ulcer edge	Irregular, sloping	Punched out	Punched out, callous border
Base	Wet, granulation tissue	Pale, dry, necrotic	Variable
Pain	Mild (relieved by elevation)	SEVERE (worse at night/elevation)	PAINLESS
Pulses	Present	ABSENT	Present
Skin	Brown pigmentation, lipodermatosclerosis	Shiny, hairless, cold	Neuropathic signs
Treatment	Compression + wound care	Revascularization - NO compression	Pressure offloading

"VENOUS = VALLEY (medial), ARTERIAL = AWAY (lateral), NEUROPATHIC = NO PAIN"

☠️ CONTACT DERMATITIS: IRRITANT vs. ALLERGIC

Feature	IRRITANT	ALLERGIC
Mechanism	Direct toxic damage - NO immune reaction	Type IV delayed hypersensitivity (T-cell mediated)
Patch test	NEGATIVE	POSITIVE
Onset	Within hours of contact	48-72 hours after re-exposure
Spreading	Stays at contact site	Can spread beyond contact
Most common cause	Soaps, detergents, wet work	Nickel, rubber/latex, poison ivy
Who gets it	Anyone (enough exposure)	Sensitized individuals only

"IRRITANT = Immediate and Irritating (everyone)" "ALLERGIC = needs re-Activation (48-72h, only sensitized)"

Key Allergens to Know:

Allergen	Source	Classic Presentation
Nickel	Jewelry, belt buckles, jeans buttons	Earlobes, wrist (watch), umbilicus
Chromate	Cement, leather, matches	Hands (construction workers), feet (shoe)
Rubber/Latex	Gloves, condoms, balloons	Hands, perioral; risk of anaphylaxis
Poison Ivy/Oak (Rhus)	Plant resin (urushiol)	Linear streaks of vesicles, VERY itchy
Shoe allergens	Rubber accelerants, chromate leather	Dorsum of foot (spares web spaces)

"Poison ivy = LINES of MISERY" → Linear streaky vesicles from brushing against plant

"NICKEL = NAVEL + NECK + NOTCH (earlobes)" → umbilicus, neck, earlobes = classic nickel sites

🌿 PATCH TESTING

Gold standard for diagnosing allergic contact dermatitis
Applied to upper back; read at 48 hours and 72-96 hours
Positive = erythema, papules, vesicles at test site
FALSE positive: irritant reaction (fades quickly)
FALSE negative: if on immunosuppressants, tested too soon after acute flare

🌸 ATOPIC DERMATITIS

Pathogenesis:

Th2-dominant immune response → ↑ IL-4, IL-13, IL-31 → IgE overproduction
Filaggrin gene mutation → defective skin barrier → allergen entry → sensitization
IL-31 = "itch cytokine"

3 Phases:

Phase	Age	Location	Lesion
Infantile	0-2 years	Face (cheeks), scalp, extensor surfaces	Acute weeping eczema
Childhood	2-12 years	Flexural creases (antecubital, popliteal)	Subacute/lichenified
Adult	>12 years	Flexural areas, hands, eyelids, neck	Chronic lichenification

Key features:

Dennie-Morgan lines - extra fold under lower eyelid
Hertoghe's sign - thinning of outer 1/3 of eyebrows
Dirty neck sign - hyperpigmentation of neck
Keratosis pilaris, pityriasis alba, white dermographism

Hanifin & Rajka Criteria (for diagnosis):

Major: pruritus, flexural involvement, chronic/relapsing course, personal/family atopy history
Minor: >3 required (dry skin, ichthyosis, keratosis pilaris, raised IgE, food allergy, etc.)

Treatments:

Severity	Treatment
Mild	Emollients + mild topical steroids
Moderate	Moderate topical steroids, tacrolimus/pimecrolimus (calcineurin inhibitors)
Severe	Potent topical steroids, phototherapy (NB-UVB), cyclosporine, methotrexate
Biologic	Dupilumab (anti-IL-4Rα - blocks IL-4 and IL-13)

"DUPILUMAB BLOCKS the DOUBLE DOOR (IL-4 + IL-13)" → single receptor, two cytokines blocked

"Atopic kids FLEX and ITCH" → flexural involvement is the hallmark from childhood onwards

🌲 POISON IVY (RHUS DERMATITIS)

Urushiol = allergen (oily resin)
Type IV hypersensitivity (like all allergic contact dermatitis)
Lesions: Linear streaking vesicles within 24-72h of exposure
Spreads by: scratching? NO! Fluid from vesicles does NOT spread it - new areas appear later because of varying amounts of urushiol absorbed at different sites
Urushiol can remain active on clothing/tools for years
Treatment: Potent topical steroids; severe cases = systemic prednisone (taper over 2-3 weeks - must be long enough or rebound occurs)

🧤 LATEX ALLERGY

Two types:

Type IV (Allergic Contact) - delayed; eczematous reaction on hands only
Type I (IgE-mediated) - immediate; urticaria, angioedema, anaphylaxis; caused by latex proteins

High-risk groups: Healthcare workers, patients with multiple surgeries, spina bifida patients, banana/avocado/kiwi allergy (latex-fruit syndrome)

"BANANA + LATEX = DANGER" → latex-fruit syndrome cross-reactivity

👟 SHOE/CHROMATE/NICKEL ALLERGY

Allergy	Distribution	Trick
Shoe allergy	Dorsum of foot (spares web spaces and soles)	Contrast with tinea pedis which starts in web spaces
Nickel	Earlobes, wrist, umbilicus	Wherever metal touches skin
Chromate	Hands (cement workers), under shoe in chromate-tanned leather	Workers, foot involvement

🔁 SUMMARY TREATMENT TABLE (No Doses)

Condition	First-Line Treatment	Alternative
Chancroid	Azithromycin single dose OR Ceftriaxone single dose	Ciprofloxacin 3 days OR Erythromycin 7 days
LGV	Doxycycline 21 days	Erythromycin 21 days
Donovanosis	Azithromycin (weekly or daily)	Doxycycline OR Ciprofloxacin OR Erythromycin OR TMP-SMX (min 3 weeks)
Gonorrhea (uncomplicated)	Ceftriaxone IM + Azithromycin	Cefixime + Azithromycin
NGU	Azithromycin single dose OR Doxycycline 7 days	Erythromycin OR Levofloxacin OR Ofloxacin
Cervicitis	Azithromycin single dose OR Doxycycline 7 days	Same as NGU
M. genitalium	Azithromycin	Moxifloxacin
PID (outpatient)	Ceftriaxone IM + Doxycycline ± Metronidazole 14 days	Cefoxitin + Doxycycline
PID (inpatient)	Cefotetan/Cefoxitin IV + Doxycycline	Clindamycin IV + Gentamicin
Bacterial Vaginosis	Metronidazole 7 days OR Metronidazole gel OR Clindamycin cream	Tinidazole OR Clindamycin oral
Vulvovaginal Candidiasis	Fluconazole single dose OR Topical azole	Extended topical azole
Atopic Dermatitis (severe)	Dupilumab	Cyclosporine, Methotrexate, Phototherapy
Prurigo Nodularis	Potent topical steroids, intralesional steroids	Dupilumab, Thalidomide, Naltrexone
Psychogenic Parasitosis	Pimozide OR Risperidone	SSRIs
Stasis Ulcer	Compression bandaging + wound care	Pentoxifylline
Allergic Contact Dermatitis	Identify + remove allergen + topical steroids	Systemic steroids (severe)

🧠 MASTER MEMORY TRICKS

Mnemonic	What it Helps Remember
"Soft HURTS, Hard DOESN'T"	Chancroid = painful; Syphilis chancre = painless
"LGV GROOVES you for LONG"	LGV = groove sign; 21-day doxycycline
"DONOVAN'S SAFETY PIN in BEEF STEAK"	Donovan bodies + beefy-red ulcer
"GNID = Gonorrhea"	Gram-Negative Intracellular Diplococci
"Quick Gonorrhea vs. Slow NGU"	3-5 days vs. 7-28 days incubation
"Wet → Scaly → Thick"	Acute → Subacute → Chronic eczema
"POMPHOLYX POPS on PALMS"	Vesicles on palms/lateral fingers
"Butterfly = can't reach mid-back"	Prurigo nodularis spares mid-back
"MATCHBOX = MIND bugs"	Delusional parasitosis
"VENOUS = Valley (medial), ARTERIAL = Away (lateral), NEUROPATHIC = No pain"	Ulcer location + features
"BANANA + LATEX = DANGER"	Latex-fruit syndrome
"NICKEL = NAVEL + NECK + NOTCH"	Nickel distribution
"Poison ivy = LINES of MISERY"	Linear streaky vesicles
"DUPILUMAB blocks the DOUBLE DOOR"	IL-4 + IL-13 via single receptor
"Atopic kids FLEX and ITCH"	Flexural involvement in childhood atopic dermatitis
"PID = Pain In the Downstairs"	CMT + adnexal + lower abdominal = diagnostic triad
"Always TWO drugs for Gonorrhea"	Ceftriaxone + Azithromycin (dual coverage)

Good luck with your oral assessments! 🎯

NEXT CAN YOU MAKE NOTES FR THIS PDF

Running Command

python3 -c " import pdfplumber with pdfplumber.open('/home/daytona/workspace/attachments/7221c298-405b-4c36-ac0e-91fa10d6b3fa/BULLOUS.pdf') as pdf: print(f'Total pages: {len(pdf.pages)}') for i, page in enumerate(pdf.pages): text = page.extract_text() print(f'--- PAGE {i+1} ---') print(text) print() " 2>&1 | head -500

Running Command

python3 -c " import pdfplumber with pdfplumber.open('/home/daytona/workspace/attachments/7221c298-405b-4c36-ac0e-91fa10d6b3fa/BULLOUS.pdf') as pdf: for i, page in enumerate(pdf.pages): if i < 7: continue text = page.extract_text() print(f'--- PAGE {i+1} ---') print(text) print() " 2>&1 | grep -v "Cannot set non-stroke" | head -600

Running Command

python3 -c " import pdfplumber with pdfplumber.open('/home/daytona/workspace/attachments/7221c298-405b-4c36-ac0e-91fa10d6b3fa/BULLOUS.pdf') as pdf: for i, page in enumerate(pdf.pages): if i < 23: continue text = page.extract_text() print(f'--- PAGE {i+1} ---') print(text) print() " 2>&1 | grep -v "Cannot set non-stroke" | head -700

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