DR P. MARAZZI / SCIENCE PHOTO LIBRARY DR P. MARAZZI / SCIENCE PHOTO LIBRARY
Close-up of a seborrhoeic keratosis, also known as seborrhoeic wart. Seborrhoeic keratoses are skin growths caused by an overproduction of keratin, a protein largely found in the outer layer of the skin. Their appearance may vary from flat, dark brown and rough patches to small wart-like protrusions covered with a greasy crust. Seborrhoeic keratoses are mainly found on the trunk and this condition is common in elderly people. They are harmless but, if unsightly, may be removed by cryosurgery or by curettage which uses a spoon-shaped surgical instrument.
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