Infected anal gland: the most common cause if an infected gland near the anus typically due to obstruction of the gland. Thus results in a small abscess. The abscess needs to drain to prevent you from becoming sick. It does this by finding a path to release to release the puss. The pathway is typically to the adjacent skin near the anus. In rare circumstance fistulas can be the result of Crohnes or cancer.
Answered 5/28/2019
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