Fujita Shigeru, Mochizuki Takashi
Fujita Dermatological Clinic, 1-8-25 Saiwai-cho, Nagaoka City, Niigata 940-0084, Japan.
Nihon Ishinkin Gakkai Zasshi. 2007;48(2):91-5. doi: 10.3314/jjmm.48.91.
We report a case of black dot ringworm on the right forearm caused by Trichophyton (T.) tonsurans. A 16-year-old male high school Judo-wrestler visited our clinic on September 30, 2005, complaining of a round erythematosquamous eruption with a distinct margin on the right forearm. Black dots were observed in the lesion. KOH-Parker ink prepared direct microscopy revealed abundant large endotrix arthroconidia in the hair shaft. Culture yielded yellowish-brown colonies. The isolate produced numerous round, short club-shaped microconidia along the hyphae unstained with lactophenol cotton blue (resembling matchsticks) and chlamydospores. PCR-RFLP analysis of internal transcribed spacer regions of ribosomal DNA revealed a banding pattern compatible with T. tonsurans. The lesion was cured by daily administration of 125 mg of terbinafine for 13 weeks.
我们报告一例由断发毛癣菌引起的右前臂黑点癣病例。一名16岁的男性高中柔道摔跤运动员于2005年9月30日前来我院就诊，主诉右前臂出现边界清晰的圆形红斑鳞屑疹。皮损处可见黑点。KOH-派克墨水制片直接镜检显示毛干内有大量大型内菌丝关节孢子。培养产生黄褐色菌落。该分离株沿未被石炭酸棉蓝染色的菌丝产生大量圆形、短棒状的小分生孢子（类似火柴梗）和厚壁孢子。核糖体DNA内部转录间隔区的PCR-RFLP分析显示出与断发毛癣菌相符的条带模式。通过每日口服125毫克特比萘芬，持续13周，皮损得以治愈。
