Erythrasma is a skin infection caused by the bacterium Corynebacterium minutissimum (C. minutissimum). This gram-positive bacterium is predominantly located in the warm, moist areas of the skin.
The bacterium specifically resides in the stratum corneum, the topmost layer of the epidermis. Erythrasma is typically found in the folds of the skin, such as the armpits and groin, and may also appear between the toes (interdigital erythrasma). Additionally, it can coexist with Candida albicans or dermatophytes like Epidermophyton, Microsporum, and Trichophyton.