Extra-Scalp Black Dot Ringworm Caused by Trichophyton tonsurans Among Contact Sports Players |
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| Authors: | Takashi Mochizuki Masako Kawasaki Kazushi Anzawa Kiyoto Kojima Junko Hatta Hiroshi Tababe Shuichi Higaki Shigeru Fujita |
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| Affiliation: | (1) Department of Dermatology, Kanazawa Medical University, Daigaku 1-1, Uchinada Ishikawa, 920-0293, Japan;(2) Division of Dermatomycology (Novartis Pharma), Research Institute of Medical Science, Kanazawa Medical University, Uchinada, Ishikawa, Japan;(3) Higaki Dermatological Clinic, Oyabe, Toyama, Japan;(4) Fujita Dermatological Clinic, Nagaoka, Niigata, Japan |
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| Abstract: | We describe here two patients with tinea corporis exhibiting black dot ringworm (BDR). A cluster of black dots was observed on the extensor surfaces of the extremities of two rather hairy male patients, a 15-year-old judo practitioner and a 26-year-old combined martial arts fighter, during treatment of tinea corporis with topical antimycotics. Direct KOH examination showed that the black dots were composed of degenerated hair with numerous arthroconidia and were indistinguishable from BDR of tinea capitis. Trichophyton tonsurans was isolated from the dots of both patients. Although they were diagnosed with tinea corporis, they required 2–3 months of treatment with oral terbinafine. Dermatologists should be aware that BDR can appear on areas of the skin other than the scalp. |
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