Here we report the case of a 3-month-old girl with tinea capitis. Her father was a judo expert. The girl developed scaly alopecia on her frontal scalp and visited our outpatient clinic. The girl was diagnosed with having tinea capitis caused by Trichophyton tonsurans from our observations of black dot ringworm, intra-follicular fungal elements and fungal culture. Her father was also found positive for T. tonsurans by hairbrush technique. The scalp lesion was improved after treatment with oral griseofulvin (10 mg/kg) and a shampoo containing ketoconazole for two months. Although many group infections of T. tonsurans have been reported among school children and adult martial artists, intrafamilial infection has been becoming more frequent among pre-school children in Japan, based on our review of the literature.
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