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Causes
By Mayo Clinic staffYou acquire warts through direct contact with the human papillomavirus (HPV). There are more than 100 types of HPV. Some types of HPV tend to cause warts on your hands, fingers or near your fingernails. Others tend to cause warts on your feet.
The virus that causes plantar warts isn't highly contagious, but it thrives in warm, moist environments, such as shower floors, locker rooms and public swimming areas. So you may contract the virus by walking barefoot in public places.
Like other infectious diseases, HPV may also pass from person to person. If you have a plantar wart, you can even spread the virus to other places on your own foot by touching or scratching. The virus can also spread by contact with skin shed from a wart or blood from a wart.
Each person's immune system responds to warts differently, so not everyone who comes in contact with HPV develops warts. Even people in the same family react to the virus differently. That's why parents and kids don't necessarily spread warts by sharing the same shower.
- Habif TP. Warts, herpes simplex and other viral infections. In: Habif TP. Clinical Dermatology: A Color Guide to Diagnosis and Therapy. 4th ed. Philadelphia, Pa.: Mosby; 2004. http://www.mdconsult.com/das/book/body/121280969-6/806516417/1195/75.html#4-u1.0-B0-323-01319-8..50014-5--cesec21_1286. Accessed Feb. 19, 2009.
- Lichon V, et al. Plantar warts: A focus on treatment modalities. Dermatology Nursing. 2007;19:372.
- Gibbs S, et al. Topical treatments for cutaneous warts. Cochrane Database of Systematic Reviews. 2006:CD001781.
- Goldstein BG, et al. Cutaneous warts. http://www.uptodate.com/home/index.html. Accessed Feb. 23, 2009.
- Aldara. Food and Drug Administration. http://www.fda.gov/medwatch/SAFETY/2004/mar_PI/Aldara_PI.pdf. Accessed Feb. 23, 2009.
- Focht DR 3rd, et al. The efficacy of duct tape vs. cryotherapy in the treatment of verruca vulgaris (the common wart). Archives of Pediatric and Adolescent Medicine. 2002;156:971.
- Your guide to diabetes: Type 1 and type 2. National Institute of Diabetes and Digestive and Kidney Diseases. http://diabetes.niddk.nih.gov/dm/pubs/type1and2/YourGuide2Diabetes.pdf. Accessed Feb. 23, 2009.
