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Article
December 1951

PIEDRA: Report of a Case

AMA Arch Derm Syphilol. 1951;64(6):767-773. doi:10.1001/archderm.1951.01570120102011
Abstract

PIEDRA is a mycotic infection characterized by firm, discrete, adherent, ovoid nodules along the hair shafts. Involvement of the scalp hairs, eyebrows, eyelashes, and beard have been reported.1 It is generally agreed that the numerous fungi reported as causing piedra can be reduced by synonomy to two principal species, namely, Trichosporum beigelii and Piedraia hortai. T. beigelii infection results in the formation of white nodules (white piedra) and P. hortai produces black nodules (black piedra). White piedra was first described in London by Beigel in 1865.2 Vuillemin in 1902 classified the causative organism as a Trichosporum. Black piedra was first reported in Rio de Janeiro by P. S. de Malgai-Haes in 1901. Except for color, the clinical features of the two types are practically identical. Both sexes and all age groups have been infected.

REPORT OF A CASE  In November, 1950, a 16-year-old white, blond youth was seen

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