Tinea corporis due to Trichophyton simii - a first case from Iran.

A 25-year-old man was examined for tinea corporis. Microscopic examination of direct 10% KOH mount of skin scraping revealed the presence of hyaline, septate, branching hyphae. Cultures inoculated with portions of skin scrapings yielded, after two weeks Trichophyton simii. The identification of the fungus was based on colony morphology on mycobiotic agar and microscopic characteristics on slide cultures. Microscopic features of T. simii were cylindrical, 3-7 celled, thin-walled macroconidia. In older culture, macroconidia converted into chlamydospores, which is an important characteristic of T. simii.