New Orleans — Dermatologists practicing medicine in tropical regions frequently treat fungal infections such as sporotrichosis, mycetoma and chromoblastomycosis — ailments that practitioners in temperate regions rarely encounter, according to Oliverio Welsh, M.D., emeritus professor, department of dermatology, Universidad Aut?noma de Nuevo Le?n, Monterrey, Mexico. Superficial skin infections are the most common fungal infections, but subcutaneous infections, known as deep mycosis or, in rare cases, disseminated fungal disease, may also occur.