DR P. MARAZZI / SCIENCE PHOTO LIBRARY DR P. MARAZZI / SCIENCE PHOTO LIBRARY
Close-up of a wart on the upper eyelid. Warts are very common, contagious and harmless growths on skin or mucous menbranes. They affect only the top layer of the skin and do not have roots or branches. They are caused by the human papillomavirus HPV, which enters the skin through small abrasions. About 50% of warts disappear spontaneously in six to twelve months. They may be removed by cryosurgery or destroyed by the application of a wart-removing liquid such as salicylic acid.
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