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Warts are small harmless tumors of the skin caused by a virus called the human papillomavirus. The appearance of warts can differ based on the type of wart and where it is located on the body. Most warts are well defined, with skin thickening. Very few go on to develop hyperplasia or malignancy (found most often with genital warts). The focus of this article is nongenital warts; when people want information about "warts," most commonly they mean nongenital warts.
Medically Reviewed by a Doctor on 12/11/2014
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