DR P. MARAZZI / SCIENCE PHOTO LIBRARY DR P. MARAZZI / SCIENCE PHOTO LIBRARY
A keratoacanthoma, also known as molluscum sebaceum, on the back of a hand. Keratoacanthomas are harmless skin nodules which most commonly develop on the face and arms of elderly people. They grow rapidly and in eight weeks reach a maximum diameter of about 2cm. They slowly disappear without treatment but some patients prefer to have them removed surgically. The cause of their appearance is unknown. Sometimes it is necessary to perform an examination of skin tissue in order to distinguish between keratoacanthomas and skin cancers.
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