Subungual onychomycosis affects the nail bed and underside of the nail. White superficial onychomycosis causes white spots and flaky patches on top of the nail. Candidal onychomycosis starts near the ...

Toenail fungus often starts with mild nail discoloration or lifting. It’s not usually serious, but the nails may thicken, become brittle, or fall off without treatment. Nail fungus (onychomycosis) is ...