A diagnostically challenging adolescent case of tinea corporis showing multiple aggregated folliculitis caused by Trichophyton tonsurans

Hiromi Maemura, Monji Koga, Kyoko Yarita, Katsuhiko Kamei, Masutaka Furue, Shinichi Imafuku

Research output: Contribution to journalArticle

Abstract

A 12-year-old boy, who belonged to a football team, visited a dermatology clinic with an erythematous lesion on his left knee in May 2015. Because the KOH examination performed by the previous doctor did not detect any fungi, topical corticosteroid was applied to the lesion but resulted in no improvement. Therefore, he was referred to our outpatient clinic in June 2015. Physical examination revealed a hyperkeratotic erythematous lesion measuring 6 × 5 cm in diameter on the left knee without black-dot ringworm. We performed a direct KOH examination again for corneocytes in the erythematous area, but no fungus was detected. Meanwhile, the growth of Trichophyton tonsurans (T. tonsurans) was confirmed by a skin-tissue culture including follicular tissue taken from the lesion. Additionally, a polymerase chain reaction analysis of DNA extracts from the cultured fungus showed an exact match for T. tonsurans, and we eventually diagnosed this case as having tinea corporis on the left knee caused by T. tonsurans. Because various clinical manifestations of tinea corporis caused by T. tonsurans have been reported, we must perform thorough examinations to make a definitive diagnosis.

Original languageEnglish
Pages (from-to)376-380
Number of pages5
JournalNishinihon Journal of Dermatology
Volume79
Issue number4
DOIs
Publication statusPublished - 2017

All Science Journal Classification (ASJC) codes

  • Dermatology

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