It is caused by several species of Corynebacterium. Obesity, hyperhidrosis, poor local hygiene, and warm, moist environments are common predisposing factors.
Trichobacteriosis axillaris
Trichomonas tenax
Alternaria tenuissima
Mycobacterium lepromatosis
Herpes gladiatorum
Epidermophyton floccosum
Elephantiasis nostras
Microsporum gypseum