Onychomycosis, more commonly referred to as nail fungus, is an infection that results to discolored and disfigured nails. There are two types of fungus that cause nail infections.

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Dermatophytes more commonly cause toenail fungus while yeast, particularly Candida, more often infect fingernails. Any of these two types of fungus can infect the nails by entering into any tiny cuts in the skin or in the space between the hard shell or the nail plate and the underlying connecting tissue or the nail bed.