Premium
Tinea nigra showing a parallel ridge pattern on dermoscopy
Author(s) -
Noguchi Hiromitsu,
Hiruma Masataro,
Inoue Yuji,
Miyata Keishi,
Tanaka Masaru,
Ihn Hironobu
Publication year - 2015
Publication title -
the journal of dermatology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 65
eISSN - 1346-8138
pISSN - 0385-2407
DOI - 10.1111/1346-8138.12830
Subject(s) - palm , ketoconazole , ridge , dermatology , lesion , pathology , malassezia , medicine , biology , antifungal , paleontology , physics , quantum mechanics
An 18‐year‐old healthy female student noticed a brown macule measuring 21 mm in diameter on the left palm and visited our clinic concerned about a cancerous mole. Dermoscopic examination revealed a brown, fine‐dotted and granule‐like structure overlapping an amorphous light brown macule. However, unlike previous cases, analysis of the high dynamic range‐converted image revealed the parallel ridge pattern frequently observed in malignant melanomas. Brown mycelia were detected on direct microscopic examination; black colonies were isolated on fungal culture and the fungus was identified as Hortaea werneckii . The lesion was treated with topical ketoconazole cream, and it diminished 1 month later.