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Verruca (Common Wart)

What is Verruca (Common Wart)?

A verruca, more commonly called a common wart, is a small, rough‑textured growth that typically appears on the hands, fingers, or around the nail beds. It is a benign (non‑cancerous) skin lesion caused by infection with certain strains of the human papillomavirus (HPV). While warts are generally harmless, they can be unsightly, occasionally painful, and may spread to other skin surfaces if not managed properly.

Most adults will develop at least one wart in their lifetime, and the condition is especially prevalent among children and teenagers. The lesions are usually skin‑colored, brown, or gray and may have a “cauliflower” appearance due to tiny black dots (thrombosed capillaries) on the surface.

Sources: Mayo Clinic; CDC

Common Causes

Warts develop when HPV penetrates the outer layer of skin, usually through a tiny cut, abrasion, or area of moist skin. The following factors increase the likelihood of infection:

• Human papillomavirus (HPV) strains 2, 4, 7, and 27 – the most common subtypes causing common warts.
• Skin breaks or micro‑traumas – cuts, scrapes, or even minor nail biting.
• Moist environments – public showers, pool decks, and locker rooms.
• Compromised immune system – HIV, organ‑transplant medications, or chronic illness.
• Frequent hand‑to‑mouth or hand‑to‑face contact – especially in children.
• Prolonged exposure to water – swimmers and people with occupations involving wet work.
• Existing skin conditions – eczema or dermatitis that disrupts skin integrity.
• Age – children 5‑12 years have the highest incidence.
• Family history – a genetic predisposition to HPV infection.
• Occupational exposure – healthcare workers, hairdressers, or anyone regularly handling contaminated tools.

Associated Symptoms

Although many warts are painless, some patients notice additional symptoms:

• Rough, grainy surface that may feel “sandpaper‑like.”
• Small black dots (clotted blood vessels) that can bleed when scratched.
• Occasional itching or mild tenderness, especially if the wart is in a pressure area.
• Spread to surrounding skin (new satellite warts).
• Hyperkeratotic (thickened) skin surrounding the lesion.

Most of these signs are benign, but change in size, color, or pain should prompt evaluation.

When to See a Doctor

While many warts resolve on their own within months to a couple of years, you should schedule a medical visit if you notice any of the following:

• Painful warts that interfere with daily activities (e.g., gripping objects, typing).
• Rapid growth or an unusually large wart.
• Bleeding that does not stop after applying pressure.
• Warts on the face, genitals, or near the eyes.
• Multiple warts appearing suddenly or spreading quickly.
• Signs of infection: redness, warmth, pus, or fever.
• Underlying health conditions that weaken immunity (e.g., HIV, chemotherapy).

Prompt evaluation can prevent complications, such as secondary bacterial infection or scarring.

Diagnosis

Healthcare providers typically diagnose common warts based on visual inspection. The process may include:

1. Physical examination – Observation of size, shape, location, and characteristic black dots.
2. Dermoscopy – A handheld magnifier that highlights vascular patterns unique to warts.
3. Biopsy (rare) – If the lesion looks atypical or does not respond to treatment, a small tissue sample may be sent for histopathology to rule out malignancy.
4. HPV typing (research setting) – Molecular tests can identify specific HPV strains but are not routinely required for common warts.

Most diagnoses are clinical; no laboratory tests are needed unless the presentation is unusual.

Treatment Options

Treatment decisions depend on wart size, location, patient age, and personal preference. Options include both medical (prescription) and at‑home remedies.

Medical Treatments

• Topical salicylic acid (SA) preparations – 17‑40% concentrations applied daily after soaking the wart. SA softens the keratin, allowing the lesion to be removed gradually. Note: Use daily for 6–12 weeks.
• Cryotherapy – Application of liquid nitrogen (−196 °C) by a clinician to freeze the wart. Typically requires 2–4 sessions spaced 2–3 weeks apart.
• Cantharidin – A blistering agent applied in the office; creates a painless blister that lifts the wart from the skin.
• Immunotherapy – Topical imiquimod or intralesional Candida antigen stimulates the immune system to fight HPV.
• Laser therapy – CO₂ or pulsed‑dye lasers vaporize wart tissue, reserved for resistant lesions.
• Prescription retinoids – Tazarotene cream may be used for stubborn warts, especially on the face.

Home & Over‑the‑Counter (OTC) Treatments

• OTC salicylic acid pads or gels (available in 17% strength).
• Duct‑tape occlusion (place adhesive tape over the wart for 6 days, remove, soak, then repeat). Evidence is mixed but may help small warts.
• OTC cryotherapy kits (spray or pen). Less potent than clinician‑administered liquid nitrogen but useful for early lesions.
• Natural remedies (e.g., tea tree oil, apple cider vinegar). Limited scientific support; use with caution to avoid skin irritation.

Regardless of method, it is essential to keep the area clean, avoid picking, and protect surrounding skin.

Prevention Tips

Because HPV spreads through direct skin contact, simple hygiene measures dramatically reduce risk:

• Wash hands frequently with soap and water, especially after touching potentially contaminated surfaces.
• Avoid biting nails or picking at cuticles.
• Keep cuts, scrapes, and athlete’s foot infections clean and covered.
• Wear flip‑flops or waterproof shoes in public showers, locker rooms, and pool areas.
• Do not share personal items such as towels, razors, or manicure tools.
• Use a barrier (e.g., gloves) if your work involves frequent hand contact with moist or contaminated surfaces.
• Consider a HPV vaccine (covers many oncogenic strains, but does **not** protect against the low‑risk types that cause common warts). Discuss vaccination with a healthcare provider.
• For children, teach proper hand hygiene and discourage thumb‑sucking or nail‑biting.

Emergency Warning Signs

Bottom Line

Common warts (verrucae) are caused by low‑risk HPV strains and are usually harmless, but they can be uncomfortable, spread, or become infected. Understanding how they develop, recognizing warning signs, and applying appropriate treatment can shorten their duration and prevent complications. When in doubt, especially if a wart is painful, changing, or located in a sensitive area, consulting a healthcare professional is the safest course.

References:

1. Mayo Clinic. “Warts.” https://www.mayoclinic.org/diseases-conditions/warts/symptoms-causes/syc-20354978.
2. Centers for Disease Control and Prevention. “Human Papillomavirus (HPV).” https://www.cdc.gov/hpv/parents/about-hpv.html.
3. National Institutes of Health. “HPV and Warts.” https://www.niaid.nih.gov/diseases-conditions/human-papillomavirus-HPV.
4. Cleveland Clinic. “Warts: Treatment Options.” https://my.clevelandclinic.org/health/diseases/15485-warts.
5. World Health Organization. “Human papillomavirus (HPV) and cervical cancer.” https://www.who.int/news-room/fact-sheets/detail/human-papillomavirus-(hpv)-and-cervical-cancer.

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