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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.
A salivary fistula can result from injury to any salivary gland, but most commonly the parotid. Fistulas forming from other glands is uncommon. Damage may be due to traumatic wound to the face e.g. bite wound or abscess drainage. Exopthalmus is the most likely cause of zygomatic fistula. The continuous flow of saliva due to trauma to the face prevents healing and therefore a fistula develops.