DR P. MARAZZI / SCIENCE PHOTO LIBRARY DR P. MARAZZI / SCIENCE PHOTO LIBRARY
Warts on the neck of a 27-year-old man. These contagious, but harmless, growths on the skin are caused by the human papilloma virus (HPV). There are at least thirty different types of HPV. Warts affect only the outermost layer of skin. Around half of them spontaneously disappear within a year. Warts can be removed using chemicals or lasers, or by freezing (cryotherapy), scraping (curettage) or burning them (cautery).
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