Piedra, black B36.3

Author: Prof. Dr. med. Peter Altmeyer

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Last updated on: 29.10.2020

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Synonym(s)

black piedra; piedra nigra; trichomycosis nodosa nigra

History
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Horta, 1911

Definition
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Variation of the white piedra by the halophilic, yeast-like fungus Piedraia hortae. The fungus, an ascomycet, was used in some black strains to dye hair.

Pathogen
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Piedraia hortae (black fungus), which lives on plants and optionally on monkey and human hairs in humid warm areas.

Occurrence/Epidemiology
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Mainly tropics, South America, Far East.

Clinical features
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Hard, brown-black, spindle-shaped nodules visible to the naked eye, mostly occurring in plural, which are firmly attached to the hair shaft. These consist of hyphae connected by a cement-like substance.

Differential diagnosis
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  • trichorrhexis nodosa
  • Trichobacteriosis

Therapy
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According to the white piedra. Cutting and shaving the affected hair. Imidazole containing cream for 7 days.

Literature
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  1. Gip L (1994) Black piedra: the first case treated with terbinafine (Lamisil). Br J Dermatol 130: 26-28
  2. Gip L (1993) Terbinafine for black piedra. Lancet 341: 1164
  3. Gupta AK et al (2003) Tinea corporis, tinea cruris, tinea nigra, and piedra. Dermatol Clin 21: 395-400
  4. Veasey JV et al (2017) White piedra, black piedra, tinea versicolor, and tinea nigra: contribution tothe
    diagnosis of superficial mycosis. To Bras Dermatol 92:413-416.

Outgoing links (1)

Piedra, white;

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Last updated on: 29.10.2020