DR P. MARAZZI / SCIENCE PHOTO LIBRARY DR P. MARAZZI / SCIENCE PHOTO LIBRARY
Excised pilonidal abscess. Granuloma in the anal cleft of a 19 year old man after an operation to excise a pilonidal abscess. A granuloma is a mass of tissue that can form at the site of an infection. A pilonidal abscess is caused when a hair grows into the skin and becomes infected.
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