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  Hi Sandra,   Fungal infection of the nails, called Onychomycosis, affects 6-8% of Americans. Different types of fungal organisms may infect the nails of the feet and toes. Candida is a common one, which may also cause vaginal yeast infection.    The toe nails are more often infected vs. fingernails. Nail fungus may spread to other nails on the hand or feet, and to other people. I do not know how much of a risk there is of transmission from the fingernails to vagina.  The type of fungi that infect toe and fingernails grow very well in dark and damp areas (unclean shower stalls, locker rooms etc.).   Your friend stated that he has yeast allergy. Yeast allergy is not the same as yeast infection. Yeast allergy is not a contagious disease. That said, your description of his problem is unusual for yeast allergy (involvement of fingers, underarms and moist areas).   If you have more questions regarding allergy or skin infections please post them.   Yours, J. Thompson, MD