An anal fistula is a small tunnel that connects an abscess, to an opening on the skin around the anus. The anus is the external opening through which feces are expelled from the body. Occasionally the glands which are present inside the anus make mucus which gets clogged and becomes infected leading to an abscess. About half of such abscesses may develop into a fistula. An anal fistula is an external opening that results in leakage of pus and bleeding. In short, an anal fistula is a small channel that can be developed between the end of the bowel and the skin near the anus. This is common among people having a past history of an anal abscess (infected cavity filled with pus). Fistula occurred when an abscess is not drained and healed properly. A severe type of Anal fistula may result in pain, bleeding, drainage, and discomfort while sitting and doing bowel movements.
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