Hereditary hypotrichosis simplex.

Hypotrichosis is a relatively common feature of a number of complex hereditary syndromes. However, the isolated variant, called hereditary hypotrichosis simplex (HHS), is especially uncommon. We present a Spanish family with 8 of 19 persons covering 4 generations affected by HHS. No associated ectodermal or other defects were noted. The pedigree was compatible with an autosomal dominant inheritance with variable penetrance.