"Nail fungus is a common infection of the nails ... More often than not, when that polish is then removed, we discover that what's hiding underneath isn't always a pretty sight.

Mycosis nail fungus, also known as onychomycosis, is a fungal infection of the nail unit. It is more common in the toenails because fungi thrive in warm, moist environments like your shoes.

Your healthcare provider will review your medical history and examine your feet and toenails to determine what's causing the problem. They may clip off part of the affected toenail, collect debris ...