DR P. MARAZZI / SCIENCE PHOTO LIBRARY DR P. MARAZZI / SCIENCE PHOTO LIBRARY
Anal fissures (open sores in the skin) surrounding a 70 year old man's anus. Anal fissures can be caused by trauma to the anal area, usually due to the passing of hard stools. This patient also has perianal dermatitis (pale area at upper left), an irritation of the skin surrounding the anal region.
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