<unk>  is one of about 150 types of<unk><unk>  in humans. Before birth, these disorders result in the abnormal development of structures including the skin, hair, nails, teeth, and sweat glands.
Hypohidrotic ectodermal dysplasia
Pure hair-nail type ectodermal dysplasia
Sugarman syndrome
Congenital generalized lipodystrophy
Hurler–Scheie syndrome
Yemenite deaf-blind hypopigmentation syndrome
Coffin–Siris syndrome
Scheie syndrome