Tinea nigra showing a parallel ridge pattern on dermoscopy. Issue 5 (13th March 2015)

• Record Type: Journal Article
• Authors: Noguchi, Hiromitsu; Hiruma, Masataro; Inoue, Yuji; Miyata, Keishi; Tanaka, Masaru; Ihn, Hironobu
• Is Part Of: Journal of dermatology. Volume 42:Issue 5(2015)
• Page Start: 518
• Page End: 520
• Publication Date: 2015-03-13
• Subjects: dermoscopy -- Hortaea werneckii -- palm -- parallel ridge pattern -- tinea nigra; Dermatology -- Periodicals; Dermatology -- Japan -- Periodicals; Skin -- Diseases -- Periodicals; 616.5005
• DOI: 10.1111/1346-8138.12830
• Languages: English
• ISSNs: 0385-2407

Abstract

Abstract: 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.