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What causes a fistula? After an abscess has been drained, a passage may remain between the anal gland and the skin, resulting in a fistula. If the gland does not heal, there will be persistent drainage through this passage. If the outside opening of the fistula heals first, a recurrent abscess may develop.
Anal fistula, or fistula-in-ano, is a chronic abnormal communication between the epithelialised surface of the anal canal and (usually) the perianal skin.Anal fistulae originate from the anal glands, which are located between the internal and external anal sphincter and drain into the anal canal.nal fistula, or fistula-in-ano, is a chronic abnormal communication between the epithelialised surface of the anal canal and (usually) the perianal skin. Anal fistulae originate from the anal glands, which are located between the internal and external anal sphincter and drain into the anal canal.