A case of acquired progressive kinking of the hair is described. There were abnormalities of both hair structure and growth. The structural change was an occasional kink or half-twist of the shaft, and the growth change, a shorter anagen phase with catagen apparently occurring as a random event such that in a population of affected hairs about a third entered catagen for every 1.5 cm increment of hair growth.
Coupe RL, Johnston MM. Acquired Progressive Kinking of the Hair: Structural Changes and Growth Dynamics of Affected Hairs. Arch Dermatol. 1969;100(2):191–195. doi:10.1001/archderm.1969.01610260067012
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