SCIENCE PHOTO LIBRARY SCIENCE PHOTO LIBRARY
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Wart on hand. Viral wart (centre) on the palm of a toddler's hand. Warts are harmless, contagious growths of the outermost layer of the skin (epidermis). They are caused by the human papilloma virus (HPV), of which there are over 30 types. Some warts spontaneously disappear. Others can be removed with chemicals or lasers or by freezing (cryotherapy) or burning (cautery).
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