Acquired progressive kinking of the hair.

The clinical findings in three new cases of acquired progressive kinking of the hair, all in females, are reported, and a review of all previously reported cases is presented. Acquired progressive kinking of the hair is an acquired disorder of hair formation in which patches of hair become tightly curled and resemble pubic hair. It seems to be more common in males and is associated with darkening of the involved hair in about two thirds of the patients. The differential diagnosis includes inherited forms of kinky hair and kinky hair secondary to mechanical, chemical, or traumatic manipulation. Drugs are infrequently implicated in its causation.