Dermatophyte fungi are confined to the keratin layer of the epidermis and include three genera: Microsporum, Epidermophyton and Trichophyton. These infections can be transmitted by human contact (anthropophilic), from the soil (geophilic) and by animal (zoophilic) spread. Dermatophyte infections usually present as an erythematous, scaly eruption, which may or may not be itchy. Asymmetry is an important clinical clue to fungal infection, as is annular morphology.