CausesBy Mayo Clinic Staff
Common warts are caused by an infection with the human papillomavirus (HPV). More than 100 types of HPV exist, but only a few cause warts on your hands. Other types of HPV are more likely to cause warts on your feet and other areas of your skin and mucous membranes. Most types of HPV cause relatively harmless conditions such as common warts, while others may cause serious disease such as cancer of the cervix.
You can get warts from skin-to-skin contact with people who have warts. If you have warts, you can spread the virus to other places on your own body. You can also get the wart virus indirectly by touching something that another person's wart touched, such as a towel or exercise equipment. The virus usually spreads through breaks in your skin, such as a hangnail or a scrape. Biting your nails also can cause warts to spread on your fingertips and around your nails.
Each person's immune system responds to the HPV virus differently, so not everyone who comes in contact with HPV develops warts.
April 09, 2015
- Goldstein BG, et al. Cutaneous warts. http://www.uptodate.com/index. Accessed Feb. 18, 2015.
- Ferri FF. Warts. In: Ferri's Clinical Advisor 2015: 5 Books in 1. Philadelphia, Pa.: Mosby Elsevier; 2015. http://www.clinicalkey.com Accessed Feb. 16, 2015.
- Kwok CS, et al. Topical treatments for cutaneous warts. Cochrane Database of Systematic Reviews. http://onlinelibrary.wiley.com/doi/10.1002/14651858.CD001781.pub3/abstract. Accessed Feb. 16, 2015.
- AskMayoExpert. Nongenital warts (adult and pediatric). Rochester, Minn.: Mayo Foundation for Medical Education and Research; 2014.
- Bruggink SC, et al. Natural course of cutaneous warts among primary schoolchildren: A prospective cohort study. Annals of Family Medicine. 2013;11:437.
- Warts. American Academy of Dermatology. http://www.aad.org/dermatology-a-to-z/diseases-and-treatments/u---w/warts. Accessed March 2, 2015.
- Lunch MD, et al. Management of cutaneous viral warts. BMJ. 2014;348:g3339.
- Kellerman RD. Diseases of the skin. In: Conn's Current Therapy 2015. Philadelphia, Pa.: Saunders Elsevier; 2015. https://www.clinicalkey.com. Accessed March 2, 2015.
- Some wart removers are flammable. U.S. Food and Drug Administration consumer update. http://www.fda.gov/ForConsumers/ConsumerUpdates/ucm381429.htm?source=govdelivery&utm_medium=email&utm_source=govdelivery. Accessed March 16, 2015.