DR P. MARAZZI / SCIENCE PHOTO LIBRARY DR P. MARAZZI / SCIENCE PHOTO LIBRARY
Fissure in perianal dermatitis. Close-up of an anal fissure (centre-left) and inflamed skin (dermatitis) around the anus (centre-right) of a 68-year-old male patient. An anal (or rectal) fissure is a break or tear in the skin of the anal canal. Most anal fissures are caused by stretching of the anal lining (mucosa) beyond its capability.
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