What should you think of in a 3-year-old who has never required a haircut? Such a child is likely to have either a hair shaft defect or a type of ectodermal dysplasia. Hair shaft defects are structural abnormalities that cause hair to be fragile and easily breakable. The defects can be recognized by microscopic evaluation. The ectodermal dysplasias may affect not only hair but also nails, teeth, and sweat glands. |
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