An anal fistula is like a small tunnel. It forms between the inside of the anal canal and the skin near the anus. Most fistulas start after an anal abscess does not heal fully. A small channel is left behind, and infection keeps coming out from it.
A fistula is an abnormal connection between two organs or between an organ and the skin. While some fistulas are simple, others are complex, with multiple branches or hidden tracts.
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