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A case report of tinea nigra palmaris caused by Hortaea werneckii
Pages: 736-739
Year: Issue:  10
Journal: Journal of Clinical Dermatology

Keyword:  Hortaea werneckiitinea nigra palmaris;
Abstract: A 24-year old female complained of an asymptomatic, round light brownish patch on the right thenar eminence for over4 years. Potassium hydroxide smears of fungal cultures showed short light brownish mycelia and thallospores. Smear stained with methylene blue revealed short mycelia and thallospores. In the culture of skin scrapings, fungi slowly grew, initially forming greywhite or olivaceous colony, and then rapidly becoming green to black colony. Flocculent dark grey to green-grey aerial mycelia presented on the colony surface. Morphology of the strain cultivated in potato dextrose agar(PDA) was consistent with Hortaea werneckii. Reproducing types observed by scanning electron microscopy were annellidic and sympodial budding. On both the flanks and the top of mycelia, there were annellides surrounded by annellospores. Gene sequencing found 100% homology with standard strain GQ334387.1(GI:254802560) Hortaea werneckii. Accordingly, a diagnosis of tinea nigra palmaris was made. The lesion disappeared after 2 weeks of twice-daily topical 5% sertaconazole nitrate ointment, with no recurrence during 3-months follow-up.
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