What You Should Know About Anal Fistulas

What is a fistula/anal abscess?
A fistula is a tract, a tunnel that begins inside the anal canal and burrows through the surrounding tissues out to the skin.

What causes a fistula?

Most fistulas are formed from an infection in the glands within the anal canal.  As the infection spreads to the tissues outside the anus, an abscess forms. When this breaks open, or is drained, a fistula (tract) sometimes remains behind.


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