Black piedra

Last Updated: 2023-07-07

Author(s): Anzengruber F., Navarini A.

ICD11: 1F2D.3

Piedra nigra, trichomycosis nodosa nigra.

Special form of the white piedra.

Mainly tropics, South America, Far East.

  • Pathogen: Piedraia hortae
  • P. hortae lives on human hair, but also on plants

Macroscopically visible, dermally palpable, blackish nodules in the area of the hair shaft.

  • Anamnesis
  • Clinical
  • Mycological diagnosis

  1. Gip, L., Black piedra: the first case treated with terbinafine (Lamisil). Br J Dermatol, 1994. 130 Suppl 43: p. 26-8.
  2. Bonifaz, A., et al., Tinea versicolor, tinea nigra, white piedra, and black piedra. Clin Dermatol, 2010. 28(2): p. 140-5.
  3. Kanitakis, J., et al., Black piedra: report of a French case associated with Trichosporon asahii. Int J Dermatol, 2006. 45(10): p. 1258-60.
  4. Gip, L., Terbinafine for black piedra. Lancet, 1993. 341(8853): p. 1164.