[Tinea faciei caused by Nannizzia persicolor : An underdiagnosed dermatophyte?]

We report on a tinea faciei caused by Nannizzia (N.) persicolor. The 4‑year-old boy had probably been infected by a guinea pig. Unambiguous infections caused by N. persicolor are rarely seen in Germany; however, this zoophilic and geophilic dermatophyte may only be rarely identified due to its resemblance to Trichophyton (T.) mentagrophytes. Therefore, the diagnostic attributes of N. persicolor and its differentiation from T. mentagrophytes are described. Particularly in case of contact with rodents, N. persicolor should be kept in mind.