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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.
Here are some of the most common forms of artervenous fistulas: 1  Acquired arteriovenous fistulas are not present at birth. 2  Arteriovenous fistulas in the face or neck cause swelling and abnormal pulsing. 3  Dural arteriovenous fistulas occur within the dura, which covers the brain.