Ribeiro1 in 1937 described, under the name of traumatic marginal alopecia, a type of alopecia observed in Negro and in mulatto women. The name given to this type of alopecia is justified by its localization at some point of the periphery of the hairy scalp and by its traumatic origin. The frequency of this type of alopecia is extraordinary in those states of Brazil in which Negroes and mulattoes are numerous. Of 100 Negro women examined at random (excluding mulattoes) the condition was present in 55 in typical discrete, early or advanced form. We found also that Negro women were attacked oftener than mulattoes, but not a single case was recorded among white women.
The symptoms of traumatic marginal alopecia as determined by one of us (O. G. C.) coincide exactly with those described by Ribeiro.1 Negresses and mulattoes in order to hide the characteristic wooly arrangement of
COSTA OG, JUNQUEIRA MA. TRAUMATIC MARGINAL ALOPECIA DUE TO TRACTION ON THE HAIR: COMPARATIVE STUDY OF ALOPECIA LIMINARIS FRONTALIS OF SABOURAUD. Arch Derm Syphilol. 1943;48(5):527–532. doi:10.1001/archderm.1943.01510050051011
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