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Stud Mycol 61(1): 77-82 2008
DOI: 10.3114/sim.2008.61.07
Copyright © 2008 CBS Fungal Biodiversity Centre
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Tinea nigra by Hortaea werneckii, a report of 22 cases from Mexico

A. Bonifaz1,*, H. Badali3,4,5, G.S. de Hoog3,4, M. Cruz2, J. Araiza1, M.A. Cruz2, L. Fierro2 and R.M. Ponce2

1 Department of Mycology, Hospital General de México, Sánchez Azcona 317-202, Col del Valle, México D.F. CP 03020, Mexico
2 Dermatology Service, Hospital General de México, Sánchez Azcona 317-202, Col del Valle, México D.F. CP 03020, Mexico
3 CBS Fungal Biodiversity Centre, P.O. Box 85167, NL-3508 AD Utrecht, The Netherlands
4 Institute of Biodiversity and Ecosystem Dynamics, University of Amsterdam, Amsterdam, The Netherlands
5 Department of Medical Mycology and Parasitology, School of Medicine, Mazandaran University of Medical Sciences, Sari, Iran

* Correspondence: Alexandro Bonifaz, a_bonifaz{at}yahoo.com.mx.

Tinea nigra is a superficial mycosis caused by Hortaea werneckii. It is an infrequent asymptomatic infection that affects human palms and soles, and is mostly observed in tropical countries. We evaluate retrospectively twenty-two confirmed cases of tinea nigra from a total of eleven yr (1997–2007) and discuss the epidemiology, clinical features and treatment of this disease. In twelve cases, adults were involved, in 10, children. In nineteen cases the disorder was located on palms of hands and in three on soles of feet. In all cases, the obtained isolates were morphologically identified as Hortaea werneckii and the identification of ten isolates was retrospectively confirmed with the help of sequences of the internal transcribed spacer regions of the ribosomal DNA. The patients received topical treatment with Whitfield ointment, ketoconazole, bifonazole, or terbinafine. Treatment with keratolytic agents and topical antifungals was effective.

Keywords Hortaea werneckii / keratolysis / melanized fungi / superficial mycosis / tinea nigra / tinea palmaris




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