A Case of Kerion Celsi due to Trichophyton rubrum Successfully Treated with Fosravuconazole.

A male in his seventies presented with multiple erythematous follicular papules on the back, followed by lesions in the occipital region and posterior neck. Fungal examination revealed kerion celsi caused by Trichophyton rubrum. The patient was treated with fosravuconazole 100 mg/day for 8 weeks, and the brush method was negative 1 month later. The oral antifungal medicines approved for treatment of tinea capitis in Japan are limited to itraconazole and terbinafine hydrochloride. However, itraconazole has many contraindicated drugs, and antifungal resistance has recently become a major concern.As the challenge of drug-resistant fungi is expected to become more significant in the future, the clinical benefits of using fosravuconazole L-lysine ethanolate (F-RVCZ) for treating kerion celsi may increase. Our experience suggests that F-RVCZ could be a valuable therapeutic option.