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Seborrheic keratosis

Seborrheic keratosis

C026/9228

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Credit

DR P. MARAZZI / SCIENCE PHOTO LIBRARY DR P. MARAZZI / SCIENCE PHOTO LIBRARY

Caption

Seborrheic keratosis. Close-up of a pigmented seborrheic keratosis (seborrheic or senile wart) on the skin of a 90-year-old male patient. This skin growth is caused by over-production of keratin. Keratin is a tough fibrous protein found in hair and the outer layer of skin. Keratoses range from flat, dark brown rough patches to small, wart-like protrusions covered with a greasy, removable crust. Seborrheic keratoses are mainly found on the trunk and usually occur in elderly patients. They are harmless, but as they are unsightly can be removed by cryosurgery (destruction of tissue using extreme cold) or surgical excision.

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