Nail Fungus Symptoms
You may have a nail fungal 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
Infected nails may also separate from the nail bed, a condition called onycholysis. You may even feel pain in your toes or fingertips and detect a slightly foul odor.