1. Introduction
- Definition: Warts are benign skin growths caused by the human papillomavirus (HPV), affecting the epidermis. Verrucas (plantar warts) are a specific type of wart that occurs on the soles of the feet and may cause pain.
- Epidemiology: Warts are common in children and young adults, with an estimated prevalence of 10–20% in school-aged children. Verrucas are particularly prevalent in those who frequently use communal showers or swimming pools.
- Significance: While harmless, warts and verrucas can cause discomfort, pain, and cosmetic concerns. They may be persistent and resistant to treatment.
2. Causes and Risk Factors
- Causes:
- Caused by various strains of HPV, which infect the skin through minor cuts or abrasions.
- Risk Factors:
- Close skin-to-skin contact or sharing contaminated surfaces or objects.
- Compromised immunity (e.g., due to medications or conditions like HIV).
- Wet or damp environments (e.g., swimming pools, gyms).
- Trauma to the skin, such as shaving or scratching.
3. Pathophysiology
- HPV infects keratinocytes in the basal layer of the epidermis, causing cellular proliferation and thickening of the skin. This leads to the formation of a wart, characterised by hyperkeratotic lesions. Verrucas, found on pressure points of the feet, often develop an inward growth due to walking pressure, resulting in pain.
4. Symptoms and Features
- Common Warts (Verruca Vulgaris):
- Rough, raised, skin-coloured or greyish lesions, often on the hands and fingers.
- Plantar Warts (Verrucas):
- Flat or inward-growing lesions on the soles, often painful.
- May have small black dots (thrombosed capillaries).
- Other Types:
- Flat Warts (Verruca Plana): Smooth, flat-topped lesions, typically on the face, hands, or legs.
- Filiform Warts: Long, narrow warts often found on the face or neck.
- Periungual Warts: Rough growths around nails, which may disrupt nail growth.
5. Complications
- Pain or discomfort, especially with verrucas on weight-bearing areas.
- Secondary bacterial infections due to scratching or trauma.
- Cosmetic concerns or emotional distress, particularly with facial warts.
- Spread of warts to other areas of the body or to other individuals.
6. Diagnosis
- Clinical Features: Diagnosis is usually based on appearance.
- Presence of rough, raised skin lesions with disrupted skin lines.
- Pinpoint black dots (thrombosed capillaries) confirm verruca.
- Differential Diagnosis:
- Calluses (lack of black dots, preserved skin lines).
- Corns (painful, often centralised lesion without thrombosed capillaries).
- Molluscum contagiosum or seborrhoeic keratosis.
7. Management Overview
- Goals: Relieve symptoms, prevent spread, and resolve lesions.
- Approach: Conservative management for asymptomatic lesions; treatment for symptomatic, bothersome, or spreading warts.
8. Treatment Options with Cost (USD)
- Over-the-Counter (OTC) Treatments:
- Salicylic acid (keratolytic): ~$10–$20 per bottle.
- Cryotherapy kits: ~$20–$40 per treatment kit.
- Prescription Treatments:
- Imiquimod cream (immune modulator): ~$200–$400 per course.
- Topical tretinoin: ~$50–$100 per course.
9. Advanced Treatment Options with Cost (USD)
- In-Office Procedures:
- Cryotherapy with liquid nitrogen: ~$100–$200 per session.
- Electrosurgery or curettage: ~$200–$500 per lesion.
- Laser therapy (pulsed dye laser or CO2 laser): ~$300–$1,000 per session.
- Other Therapies:
- Intralesional immunotherapy (e.g., Candida antigen): ~$100–$300 per session.
10. Pharmacological Treatment
- First-line: Salicylic acid for most warts; apply daily after softening the skin in warm water.
- Second-line: Cryotherapy for resistant warts.
- Refractory Cases: Topical imiquimod or tretinoin, or advanced procedures like laser therapy.
11. Medication Tables
Table 1: Doses and Side Effects
| Drug | Indication | Dose | Common Side Effects |
|---|---|---|---|
| Salicylic acid | Common warts, verrucas | Apply daily after soaking wart | Skin irritation, redness |
| Imiquimod | Resistant warts | Apply 3 times weekly | Local inflammation, itching |
| Tretinoin cream | Flat warts | Apply daily at night | Dryness, peeling, irritation |
| Cryotherapy (OTC) | Common warts, verrucas | Apply once per wart every 2 weeks | Local blistering, mild pain |
Table 2: Brand Names and Approximate Costs (USD)
| Drug | Brand Names | Approx. Cost |
|---|---|---|
| Salicylic acid | Compound W, Duofilm | $10–$20 per bottle |
| Imiquimod | Aldara | $200–$400 per course |
| Tretinoin cream | Retin-A | $50–$100 per tube |
| Cryotherapy kits | Dr. Scholl’s Freeze Away | $20–$40 per kit |
12. Lifestyle Interventions
- Avoid picking or scratching warts to prevent spreading.
- Keep feet clean and dry; use flip-flops in communal showers or swimming pools to reduce exposure to HPV.
- Cover warts with waterproof plasters if swimming or in close contact with others.
- Boost immunity through a healthy diet, exercise, and adequate sleep.
13. Monitoring Parameters
- Assess for size reduction and symptom relief after initiating treatment.
- Monitor for side effects of topical treatments like irritation or peeling.
- Evaluate for recurrence or spread of warts despite treatment.
14. Patient Counseling Points
- Explain that warts often resolve spontaneously within 1–2 years but may require treatment if bothersome or spreading.
- Advise adherence to treatment, as many therapies require consistent application for several weeks.
- Emphasise preventive measures, such as avoiding barefoot walking in communal areas and sharing personal items.
- Reassure patients that recurrence is common, but persistence with treatment is often successful.
15. Special Populations
- In Children: Use milder treatments like low-concentration salicylic acid; cryotherapy may be distressing for younger children.
- In Immunocompromised Patients: Warts may be more resistant to treatment; consider advanced therapies like immunotherapy.
- In Pregnant Women: Avoid systemic treatments; opt for topical salicylic acid or cryotherapy.
16. Prevention
- Avoid direct contact with warts, including one’s own.
- Do not share towels, socks, or shoes with others.
- Use protective footwear in communal showers, gyms, or pools.
- Maintain good skin hygiene and moisturisation to prevent cracks and abrasions.
17. FAQs
- What causes warts and verrucas?
Answer: They are caused by infection with human papillomavirus (HPV). - Are warts contagious?
Answer: Yes, they can spread through direct contact or contaminated surfaces. - How are verrucas different from warts?
Answer: Verrucas are warts on the soles of the feet that often grow inward due to pressure. - Do warts go away on their own?
Answer: Yes, most warts resolve spontaneously within 1–2 years. - What is the best treatment for verrucas?
Answer: Salicylic acid or cryotherapy are effective first-line options. - Can warts return after treatment?
Answer: Yes, recurrence is common, especially if the virus persists. - Are there home remedies for warts?
Answer: Duct tape occlusion therapy is a popular but unproven method. - How can I prevent spreading warts?
Answer: Avoid scratching or picking, and cover warts with a plaster. - Can warts be painful?
Answer: Verrucas can cause pain, particularly on weight-bearing areas. - When should I see a doctor for warts?
Answer: If warts are painful, spreading, or resistant to home treatments. - Are over-the-counter treatments effective?
Answer: Yes, salicylic acid and cryotherapy kits are effective for most cases. - Can children use cryotherapy?
Answer: Yes, but professional application is often better tolerated. - What is the role of the immune system in warts?
Answer: A strong immune response can help clear warts naturally. - Are there vaccines for warts?
Answer: The HPV vaccine prevents certain types of HPV but not all strains causing warts. - Can warts become cancerous?
Answer: Rarely, some HPV strains are associated with skin or mucosal cancers, but common warts are usually benign.