Ankyloblepharon-ectodermal defects-cleft lip/palate syndrome (AEC syndrome) is a form of ectodermal dysplasia, a group of conditions characterized by abnormal development of ectodermal tissues including the skin, hair, nails, teeth, and sweat glands. The most common feature is missing patches of skin (erosions) on the scalp, neck, hands, and feet. The skin erosions can lead to infection, scarring, and hair loss. Other features include changes in skin coloring; misshapen or absent fingernails and toenails; malformed or missing teeth; increased sensitivity to heat; hearing loss; cleft lip and/or palate; and other facial abnormalities. This condition is caused by mutations in the TP63
gene and is inherited in an autosomal dominant fashion. Rapp-Hodgkin syndrome was classified as a separate disorder until it was discovered that it result from mutations in the same part of the TP63 gene, and, therefore, most researchers now consider Rapp-Hodgkin syndrome and AEC syndrome to be part of the same disease spectrum.