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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.
The most common causes of a perlymph fistula is trauma to the head or a sudden change in atmospheric presssure, called barotrauma, usually occurring on an airplane or scuba diving. A perilymph fistula has been seen as a side effect of syphilis or Lyme disease. In some cases, the cause of a perilymph fistula is unknown.