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Diagnosis: Plantar Wart (Verruca Plantaris) with Hyperkeratotic Callus
The image shows a thick, dry, hyperkeratotic plaque covering the tip and dorsal surface of the hallux (big toe). The hallmark features visible are:
- Thick white/yellow keratotic buildup over the toe
- Dry, cracked, scaly surface with a rough texture
- Localized to a pressure/friction point
This is consistent with a plantar/digital wart (Verruca plantaris/vulgaris) with overlying callus formation, caused by Human Papillomavirus (HPV types 1, 2, and 4). The differential diagnosis includes a simple callus (tyloma) - the key distinguishing feature is that when you pare away the callus from a wart, you see tiny punctate bleeding points, which is nearly pathognomonic for HPV. A simple callus does not bleed on paring and shows no skin-line interruption.
Treatment
Treatment follows a stepwise approach based on lesion size, duration, and response.
Step 1 - General Measures (for all patients)
- Soak the lesion in warm water, then pare/debride the callus with a pumice stone or blade before any treatment - this improves penetration of all agents
- Eat a diet rich in fruits and vegetables; supplement with folic acid 1 mg
- Avoid smoking (reduces skin immunity via Langerhans cell depletion)
- Enhance immune function as much as possible
Step 2 - First-Line: Over-the-Counter Topicals (mild/early lesions)
- Salicylic acid 17-40% (Compound-W, Dr. Scholl's, Mediplast, Occlusal, DuoFilm)
- After soaking and paring, apply every 48 hours under occlusion
- Remove dead tissue between applications with pumice or paring
- Continue for 4-6 weeks with consistent daily use
- Non-scarring; effective but requires compulsive adherence
Step 3 - Physician-Applied Options
| Treatment | Details |
|---|---|
| Cryotherapy (liquid nitrogen) | First-line office treatment; does not cause scarring; highly effective for plantar warts; preferred over surgery |
| Bichloracetic or Trichloroacetic Acid (50-85%) | Applied by physician after paring; caustic - not for home use |
| Cantharidin 0.7% | Applied in office, causes blister formation; effective |
| 5-Fluorouracil 5% cream | Topical antimetabolite |
| Imiquimod (Aldara) | Immunomodulator; pare callus first, rub in thoroughly |
| Tretinoin 0.05-0.1% | Can be used adjunctively |
Important: Avoid surgical excision on the plantar surface/toes - scar tissue is often permanently painful, like a pebble in a shoe.
Step 4 - Preferred for Large or Persistent Lesions: Candida Antigen Injection
- Candida antigen (Candin 1:500) is now the first-line approach for all but the simplest cases
- Mix 1:1 with 1-2% lidocaine without epinephrine; inject 0.1-0.3 mL intralesionally with a 30-gauge needle
- Repeat at 1-month intervals x 3 sessions
- Expected efficacy: 65-75% with first injection; 80-85% after three treatments
- Advantages: Minimal scarring, no "downtime," rare adverse reactions, immune activation can clear all warts (not just injected ones)
Step 5 - Refractory Cases: Bleomycin
- Bleomycin 1 U/mL injected intralesionally at 1-month intervals x 3
- Reserved for failure of Candida antigen or other methods
Treatment Algorithm (from Pfenninger and Fowler's Procedures for Primary Care)
Key Points
- 60% of warts resolve spontaneously over time, so watchful waiting is reasonable in mild, asymptomatic cases
- Recurrence rates with all treatments are 30% or higher - this is expected
- The virus is never fully eliminated; the immune system keeps it in remission
- If the diagnosis is uncertain (wart vs. callus vs. other), obtain a shave biopsy before treating
- In immunosuppressed patients, success rates are significantly lower and HPV-associated malignancy risk is elevated
Source: Pfenninger and Fowler's Procedures for Primary Care, 3rd Ed., Chapter 42
Disclaimer: This information is for educational purposes. Please consult a dermatologist or podiatrist for diagnosis confirmation and individualized treatment.
Create a patient education handout on plantar wart causes and home care
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Your patient education handout is ready for download:
Plantar Wart Patient Handout
Word Document · DOCX
Here is what the handout covers, laid out in a clean two-colour design (teal + white) with section rules, shaded info boxes, and a branded header/footer:
| Section | Content |
|---|---|
| What Is a Plantar Wart? | Plain-language definition, medical name, HPV types, benign nature |
| How to Recognise One | Key visual signs including the "black dots" and wart vs. callus distinction |
| Causes & How It Spreads | HPV mechanism, common transmission routes, risk factors |
| Home Care Step-by-Step | 6-step illustrated table: soak → pare → dry → apply → cover → repeat |
| OTC Products to Use | Named products by type and strength (17% vs. 40% salicylic acid, duct tape method) |
| General Health Tips | Diet, folic acid, smoking cessation, immune support |
| Preventing Spread | Footwear, hygiene, not sharing tools, keeping wart covered |
| What NOT to Do | Highlighted warning boxes for dangerous home remedies |
| When to See Your Doctor | Clear red-flag criteria including diabetes, rapid growth, failed home treatment |
| FAQ | Spontaneous resolution, recurrence, exercising safely, school attendance |
The footer on every page reads: "This handout is for educational purposes only. Always follow your doctor's instructions."
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Plantar Wart Patient Handout
PDF Document · PDF
The DOCX is also still available if you need to edit it:
Plantar Wart Patient Handout
Word Document · DOCX
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