DR P. MARAZZI / SCIENCE PHOTO LIBRARY DR P. MARAZZI / SCIENCE PHOTO LIBRARY
Pilonidal sinus. Close-up of the buttocks of a 16 year old boy 1 day after surgery to repair a pilonidal sinus. A pilonidal sinus is an open wound caused when a hair grows into the skin and becomes infected. Treatment is surgery to remove a wide area of tissue around the wound.
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