DR P. MARAZZI / SCIENCE PHOTO LIBRARY DR P. MARAZZI / SCIENCE PHOTO LIBRARY
Wart. Close-up of warts growing around the nail on a finger. Warts are harmless, contagious lumps on skin, caused by human papillomavirus infection. Warts are usually left to disappear spontaneously, but are sometimes removed by freezing, surgery, or special plasters.
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