Understanding Warts: Causes, Types, and Treatments | Easy Guide

Alan Lucks | MD

Medically reviewed by Alan Lucks | MD, Alan Lucks MDPC Private Practice - New York on December 28th, 2023.

Key Takeaways

  • Human papillomavirus (HPV) causes these growths through over 100 different strains, with types 1, 2, and 4 responsible for common hand and foot varieties, while types 6 and 11 cause 90% of genital cases.
  • Common varieties resolve spontaneously in 2-3 years in most healthy individuals, but plantar types on feet can persist for decades and spread across the sole if left untreated.
  • Over-the-counter salicylic acid (17-40% concentration) applied daily after soaking removes infected skin layers gradually, with success rates of 70-80% when used consistently for 8-12 weeks.
  • Cryotherapy using liquid nitrogen achieves clearance in 50-70% of cases after 2-4 treatments spaced 2-3 weeks apart, though temporary pain and blistering are common.
  • The virus survives on surfaces for months and spreads easily in moist environments—public pools, locker rooms, and shared towels are primary transmission sources.

Warts are small, rough skin growths caused by the human papillomavirus (HPV). They are very common, with 3 out of 4 people developing a wart at some point in their lives. Although warts are usually harmless, it's important to understand their causes, types, and treatment options.

What Causes Warts?

Warts are caused by direct contact with the contagious HPV virus. The virus can spread through person-to-person contact or by touching an object used by someone with the virus. HPV stimulates the rapid growth of cells on the skin's surface, resulting in the formation of warts.

Types of Warts

There are several types of warts, each with distinct characteristics:

  • Common warts (verruca vulgaris): These flesh-colored or light brown bumps usually appear on the fingers, near the fingernails, or on the hands.

  • Plantar warts: These warts affect the soles of the feet and often have small, clotted blood vessels that resemble tiny black dots.

  • Flat warts (verruca plana): These small, smooth, flat bumps are pink or brown and commonly appear on the face or legs, especially in children and teens.

  • Genital warts: These warts appear in the pubic area, on the genitals, in or around the anus, and/or in the vagina. They are flesh-colored, pink, or red and may resemble small parts of a cauliflower.

Understanding Warts: Causes, Types, and Treatments | Easy Guide

Wart Treatment Options

Most warts on the skin are harmless and may go away without treatment. However, genital warts should always be evaluated by a doctor. Treatment options for warts include:

  • Freezing (cryotherapy): Over-the-counter freezing sprays or liquid nitrogen applied by a doctor can freeze and destroy the wart tissue.

  • Salicylic acid: Over-the-counter gels, ointments, or pads containing salicylic acid can gradually dissolve the wart when applied regularly.

  • Cantharidin: This substance, derived from a blister beetle, is applied to the wart to form a blister that lifts the wart off the skin.

  • Other medications: Prescription medications like bleomycin (injected) or imiquimod (cream) can kill the wart virus or stimulate the immune system to fight it off.

  • Minor surgery: A doctor can cut away the wart or destroy its base using an electric needle or cryosurgery.

  • Laser surgery: An intense beam of light (laser) is used to burn and destroy the wart tissue.

Preventing Warts

To prevent the spread of warts, avoid picking at them, keep your hands dry, and wash your hands thoroughly after touching any warts. Never brush, comb, or shave areas with warts. To prevent genital warts, practice safe sex by using condoms, limiting sexual partners, and getting the HPV vaccine.

When to See a Doctor

While most warts are harmless, it's important to see a doctor if you have genital warts, if your warts are painful or spreading, or if you have a weakened immune system. A healthcare professional can provide an accurate diagnosis and recommend the most effective treatment options for your specific case.

For more information on warts and their treatment, consult reputable sources like the American Academy of Dermatology or the Centers for Disease Control and Prevention.

The Bottom Line

Most cases clear naturally within 2-3 years, but persistent growths respond well to consistent salicylic acid treatment or professional cryotherapy. Genital varieties always warrant medical evaluation due to cancer risk from high-risk HPV strains. If you're dealing with persistent growths or want guidance on treatment options, Doctronic can provide expert assessment and personalized recommendations.

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