Anal fistula. Close-up of the anus of a person with a fistula and subsequent abscess. An anal fistula is a split in the rectum that forms into a chann

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Anal fistula. Close-up of the anus of a person with a fistula and subsequent abscess. An anal fistula is a split in the rectum that forms into a channel that opens in the skin. It can be caused by infection and inflammation. An abscess is a pocket of pus formed due to a bacterial infection.

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Photo credit: © CNRI/SCIENCE PHOTO LIBRARY / Alamy / Afripics
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