Maxillary double lip: report of two cases.

Two cases of double lip malformation, an uncommon oral anomaly, are presented, and the factors involved in the development, pathogenesis, diagnosis, and treatment of these uncommon lesions are reviewed. Double lip is usually associated with Ascher's syndrome, which is a rare disease with three more or less consistently associated abnormalities: double upper lip, blepharochalasis and enlargement of the thyroid. Two cases of double lip are reported; one of which was related with Ascher's syndrome, while the other had a traumatic origin.