An infection of nail fungus occurs when fungi infect one or more of your nails. A nail fungus infection may begin as a white or yellow spot under the tip of your fingernail or toenail. As the fungus spreads deeper into your nail, it may cause your nail to discolor, thicken and develop crumbling edges — an unsightly and potentially painful problem.
An infection with nail fungus may be difficult to treat, and they often will recur. That makes it all the more important to find a reputable toenail fungus treatment and begin as soon as you become aware that you indeed have a toenail fungus infection.
You more than likely have a nail fungus infection — also called onychomycosis (on-i-ko-mi-KO-sis) — if one or more of your nails are:
- Brittle, crumbly or ragged
- Distorted in shape
- Dull, with no luster or shine
- A dark color, caused by debris building up under your nail