DefinitionEctodermal dysplasia is a group of conditions in which there is abnormal development of the skin, hair, nails, teeth, or sweat glands.Alternative NamesAnhidrotic ectodermal dysplasia; Christ-Siemens-Touraine syndromeCauses, incidence, and risk factorsThere are many different types of ectodermal dysplasia.Many gene defects can cause ectodermal dysplasias. The most common form of ectodermal dysplasia usually affects men. Other forms of the disease affect men and women equally.SymptomsPeople with ectodermal dysplasia may not sweat or may have decreased sweating because of a lack of sweat glands.Children with the disease may have difficulty controlling fevers. Mild illness can produce extremely high fevers, because the skin cannot sweat and control temperature properly.Affected adult