Diagnosis: Plaque Psoriasis (Psoriasis Vulgaris)

• Well-demarcated erythematous plaques on the extensor surface (knee)
• Thick silvery-white micaceous scale
• Multiple confluent plaques on a typical predilection site

Treatment - Pakistani Brands

Step 1: Keratolytic (scale removal first)

Step 2: Topical Corticosteroids (first-line)

Step 3: Vitamin D Analogue (maintenance / steroid-sparing)

Step 4: Emollients (always use alongside)

• Vaseline (petroleum jelly) - widely available, cheap
• E45 cream, Aqueous cream - for moisturization between treatments
• Glaxose-D or Dermofilm lotions - for non-scalp use

Step 5: If thick refractory plaques

• Coal tar 5% preparations: Exorex lotion if available, or compounded by pharmacist
• Anthralin (dithranol) - available on prescription in some centers

Practical Treatment Protocol

1. Apply salicylic acid (Salac/Keralyt) to thick scale areas for 1-2 hours before steroid
2. Apply Dermovate (clobetasol 0.05% ointment) once daily for 2 weeks
3. Moisturize with Vaseline/aqueous cream liberally

• Switch to Daivobet ointment once daily
• Or use clobetasol only on weekends (pulse therapy)
• Continue emollients daily

• Long-term potent steroids without breaks (skin atrophy, tachyphylaxis)
• Abrupt steroid withdrawal (rebound)
• Corticosteroids on face/flexures (use mild ones there)

Important note: This is a clinical assessment based on image findings. A dermatologist should confirm the diagnosis and supervise treatment, especially for widespread disease or if lesions fail to improve within 4-6 weeks. Psoriasis with joint pain warrants rheumatology referral.

Revised Diagnosis: SCABIES (Sarcoptes scabiei infestation)

Why Scabies - Not Psoriasis

• Does it itch worse at night? (nocturnal pruritus = scabies hallmark)
• Are family members itching too? (household transmission is common)
• Itching on wrists, genitals, nipples, waist?

Treatment in Pakistani Brands

1st Line - Permethrin 5% Cream (Drug of Choice)

• Apply from neck to toes (every skin fold, under nails, between fingers, armpits, groin)
• Leave on for 8-12 hours (overnight), then wash off
• Repeat after 7-14 days (kills newly hatched mites)
• All household contacts must be treated simultaneously even if symptom-free

2nd Line - Oral Ivermectin (if permethrin fails or for family clusters)

• More convenient for large families
• Give 2 doses - day 1 and day 14 (not ovicidal, so repeat needed)
• Avoid in children <15 kg, pregnancy, breastfeeding

3rd Line - Benzyl Benzoate 25% Lotion (cheapest, widely available)

• Dilute to 12.5% for children
• More irritating than permethrin but effective

4th Line - Sulfur 6-10% in petrolatum

• Compounded by pharmacist (sulphur + Vaseline)
• Cheapest option, safe in pregnancy and infants
• Apply 3 nights consecutively

For Itch Relief (adjunct - important!)

Key Instructions for Patient

1. Treat all household contacts on the same day - even if not itching yet
2. Wash all clothing, bedding, towels in hot water (>60°C) on treatment day
3. Itch can persist 2-4 weeks after successful treatment - this is normal (hypersensitivity reaction to dead mites), do NOT re-treat too early
4. If itch persists beyond 4 weeks or worsens - consider treatment failure or re-infestation

Note: This is clinical assessment only. A dermatologist can confirm with dermoscopy or skin scraping (mineral oil prep) to visualize mites/eggs/fecal pellets under microscope.

What I See in the Picture (Re-examined for Scabies)

• 3 grouped erythematous (red) nodules/papules on what appears to be the elbow/knee area
• Excoriation and crusting on top - from repeated scratching
• Surrounding skin inflammation - the redness around the lesions
• The lesions look raised, nodular - not flat plaques
• The dark/purple discoloration in the center = post-scratch hyperpigmentation + crust

Additional Questions to Ask the Patient

Most Important (Diagnostic)

1. "Does the itching get worse at night?" - Nocturnal pruritus is the hallmark of scabies
2. "Is anyone else in your family or home itching?" - Household transmission confirms scabies
3. "Do you have itching on your wrists or between your fingers?" - Classic burrow sites
4. "Do you have itching on your genitals/waist/nipples?" - Pathognomonic sites in adults

To Assess Severity

1. "How long has this been going on?" - Weeks = typical scabies; months = possibly crusted/Norwegian scabies
2. "Have you tried any treatment already?" - Treatment failure raises suspicion of crusted scabies or resistance
3. "Are there small thin lines on the skin between fingers?" - Burrow tracks (pathognomonic)

To Rule Out Complications

1. "Any pus, yellow discharge, or fever?" - Secondary bacterial infection (impetigo on top of scabies is very common in Pakistan)
2. "Any swollen glands?" - Lymphadenopathy from secondary infection

To Rule Out Differentials

1. "Do you have any kidney disease or taken steroids recently?" - Rules out crusted scabies risk
2. "Any similar rash on face or scalp?" - If yes, think crusted scabies or different diagnosis entirely (scabies spares the face in adults)

Quick Bedside Confirmation

Scabies is Now Unlikely - Here is the Revised Analysis

Why Scabies Does NOT Fit This Case

Most Likely Diagnosis: Childhood Atopic Dermatitis (Eczema)

"During childhood, lesions tend to be less exudative. The classic locations are the antecubital and popliteal fossae (elbows, knees), flexor wrists, ankles... Lesions are often lichenified, indurated plaques intermingled with isolated, excoriated 2-4mm papules... Pruritus is a constant feature."

What the Picture Actually Shows - Now Re-read as Eczema:

• Lichenified (thickened) plaques on elbow - from chronic scratching
• Excoriated papules with crusting - scratch marks and scabs
• Erythema surrounding the plaques
• 3 grouped lesions at elbow extensor surface = classic childhood AD location

Second Differential: Psoriasis (original thought)

Key Questions to Ask NOW to Confirm Eczema

1. "Does anyone in family have asthma, hayfever, or allergies?" - Atopic triad (asthma + eczema + rhinitis runs in families)
2. "Does the child have dry skin in general?" - Xerosis is key AD feature
3. "Does it itch more with sweat or heat?" - Classic AD trigger
4. "Any history of similar rash since childhood/infancy?" - AD often starts in infancy
5. "Any rash in the inner elbows or behind the knees?" - Flexural AD is diagnostic
6. "Does the child have asthma?" - Strongly supports atopic diagnosis

Treatment for Childhood Atopic Dermatitis - Pakistani Brands

Step 1: Emollients (most important - use generously, multiple times daily)

• Vaseline (petroleum jelly) - best and cheapest
• E45 cream or Aqueous cream - widely available
• Apply immediately after bathing on damp skin

Step 2: Topical Corticosteroids (for flares)

• Use for flares only (7-14 days), then stop
• Never use potent steroids on face

Step 3: Antihistamines for Itch

Step 4: Calcineurin Inhibitors (steroid-sparing, for sensitive areas)

• Tacrolimus 0.03% ointment (Protopic - LEO Pharma) - available in Pakistan for children ≥2 years
• Useful for face/folds where steroids cause atrophy

Bottom line: This is most likely Childhood Atopic Dermatitis. Ask about family atopy history, dry skin, and flexural involvement to confirm. Psoriasis remains a secondary possibility. Scabies is now very unlikely given the sleep pattern and absence of classical sites.