Nail Fungal Infection

Fungal infection of the toenails (also called onychomycosis) occurs when a fungus infects the tissue underneath the toenail. The result is discoloration of the nail, which can become thickened and raised.

It commonly involves several nails simultaneously and often occurs in people with persistent moisture in their feet, such as those with footwear that prevents air circulation, or in those who perspire excessively in their feet.