The Bottom Line

Common warts are benign (non-cancerous) skin growths caused by specific types of HPV—most often types 2, 4, and 27. They affect 10–20% of school-age children and are spread by skin contact. About 30% of untreated warts resolve within one year, and up to 70% resolve within five years. When treatment is needed, salicylic acid and cryotherapy (freezing) are the most effective options.

What Are Common Warts?

Common warts (also called verrucae vulgares) are small, rough skin growths caused by the human papillomavirus (HPV). HPV types 2, 4, and 27 cause about 70% of common warts, with type 1 responsible for another 10–15%. These are low-risk HPV types that only affect skin—they are completely different from the high-risk HPV types linked to cervical cancer.

Common warts are among the most prevalent skin conditions in the world. They affect 10–20% of school-age children and about 5–10% of adults. Peak occurrence is during childhood (ages 5–15), and rates are similar in males and females. About 30% of family members will also develop warts if they live with someone who has them, suggesting a hereditary component to wart susceptibility.

Signs and Symptoms

Common warts are typically:

  • Flesh-colored or brownish, rough-surfaced bumps, 2–10 mm in diameter (about the size of a pencil eraser or smaller)
  • Dome-shaped with a bumpy, cauliflower-like surface from enlarged skin ridges underneath
  • Often showing tiny black dots when you look closely—these are small clotted blood vessels inside the wart
  • Located most often on the hands, fingers, around the nails, knees, and elbows—areas prone to friction and minor trauma
  • Usually painless, though they can be tender if bumped or located on a pressure point

About 60% of people develop multiple warts, either clustered together or scattered. Warts can also spread in a line ("lightning streak" pattern) along an area of scratched skin, or form satellite lesions around a primary wart from autoinoculation (spreading the virus from one spot to another on your own body).

What Causes Common Warts?

HPV enters the skin through small cuts, abrasions, or areas of friction. Once inside, the virus infects the basal cells (the deepest layer of the outer skin) and forces them to multiply abnormally fast, creating the raised, rough wart. Your immune system's ability to detect and fight the virus determines whether a wart forms, how long it lasts, and whether it spreads. People with weaker immune systems—such as organ transplant recipients or people with HIV—develop warts far more easily and have more difficulty clearing them. Children with atopic dermatitis (eczema) are 2–3 times more likely to develop warts than the general population.

Warts spread through:

  • Direct skin-to-skin contact with a wart
  • Touching contaminated surfaces (gym equipment, swimming pool areas)
  • Autoinoculation—spreading the virus from an existing wart to nearby or other skin areas, especially through picking or biting

Treatment Options

Many warts will eventually go away without treatment. But treatment makes sense if warts are painful, spreading, or cosmetically bothersome. Here are the main options:

  • Salicylic acid (over the counter, first-line): Available as liquids, gels, and medicated pads (15–40% concentration). Applied daily after soaking the wart in warm water. Works by dissolving the keratin that makes up the wart, layer by layer. Weekly trimming with a pumice stone or emery board improves results. With 12 weeks of consistent use, achieves about 70% clearance. Inexpensive and safe for home use.
  • Cryotherapy (office procedure, highly effective): Liquid nitrogen at -196°C is applied to freeze the wart. Each session takes 10–30 seconds. Most warts need 3–6 sessions every 2–4 weeks. Clears 70–90% of common warts. Mildly painful with expected blister formation that aids healing. Plantar warts need longer freeze times (30–60 seconds) due to thick overlying skin.
  • Duct tape occlusion: Some evidence suggests covering warts with duct tape for several days, then filing with a pumice stone, can help—though evidence is mixed. Safe to try alongside other treatments.
  • Curettage and cauterization: Office procedure under local anesthesia where the wart is scraped off and the base is burned to prevent regrowth. More definitive than topical treatments, though it does carry a small scar risk.
  • Laser therapy: CO2 or erbium laser removes wart tissue precisely. Useful for resistant warts or those in cosmetically sensitive areas, though healing takes longer than cryotherapy.
  • Immunotherapy (imiquimod): Prescription cream that activates the local immune response to fight HPV. Applied 3 times per week. Particularly useful for people with weakened immune systems, achieving about 60% response.

Combination approaches—for example, starting with cryotherapy and then maintaining with daily salicylic acid—often improve outcomes for stubborn warts.

When to See a Dermatologist

  • Warts are painful, rapidly growing, or spreading despite home treatment
  • You have not seen improvement after 12 weeks of daily salicylic acid use
  • Warts are on your face, genitals, or around the nails
  • You have many warts or you have a weakened immune system
  • You cannot tell whether the skin growth is a wart or something else (some skin cancers can look like warts)
  • A child under 2 years has warts

Frequently Asked Questions

What is the difference between common warts and plantar warts?

Common warts typically grow on the hands, fingers, and elbows and project outward from the skin. Plantar warts grow on the bottom of the foot and are pushed inward by body weight, making them painful to walk on. Both are caused by similar HPV types and treated in similar ways, though plantar warts usually require more aggressive treatment due to the thick skin of the sole.

Can I use over-the-counter treatments for warts on my hands?

Yes. Salicylic acid products (like Compound W, Dr. Scholl's) are safe and effective for warts on hands, fingers, and feet. Avoid using them on the face, genitals, or mucous membranes. If the wart does not respond after 12 weeks of consistent daily use, see a dermatologist.

Do warts come back after treatment?

Recurrence is common—about 10–30% of treated warts return—because the surrounding skin may still harbor dormant HPV. This is why dermatologists sometimes treat a slightly wider area around the visible wart. Completing the full course of treatment and not picking at healing tissue helps reduce recurrence.

Are common warts dangerous?

No. Common warts are benign (non-cancerous) and caused by low-risk HPV types that have no link to cancer. They are entirely different from the high-risk HPV types (16 and 18) that cause cervical and other genital cancers. Common warts are a cosmetic and comfort issue, not a health risk.

References

  1. Kwok CS, et al. Topical treatments for cutaneous warts. Cochrane Database Syst Rev. 2012;9:CD001781.
  2. Sterling JC, et al. Guidelines for the management of cutaneous warts. Br J Dermatol. 2014;171(4):696-712.
  3. Gibbs S, Harvey I. Topical treatments for cutaneous warts. Cochrane Database Syst Rev. 2006;3:CD001781.
  4. Lipke MM. An armamentarium of wart treatments. Clin Med Res. 2006;4(4):273-293.

Trusted Resources

Always consult a board-certified dermatologist for diagnosis and personalized treatment recommendations.