DR P. MARAZZI / SCIENCE PHOTO LIBRARY DR P. MARAZZI / SCIENCE PHOTO LIBRARY
Seborrhoeic keratosis. Close-up of a seborrhoeic keratosis on the skin of an 88-year-old woman. Also known as seborrhoeic warts, these skin growths are 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. Seborrhoeic keratoses are mainly found on the trunk and usually occur in the elderly. They are harmless, but as they are unsightly can be removed by cryosurgery (destruction of tissue using extreme cold) or surgical excision.
Model release not required. Property release not required.