Do your nails look yellow, thick, or brittle? Learn how nail fungus develops and how to effectively treat both fingernail and toenail infections.
Nail fungus, medically known as onychomycosis, is a common infection that affects the nail plate, bed, or both. It occurs when fungi — usually dermatophytes, yeasts, or molds — invade the nail through small cracks or injuries. Without treatment, it can lead to pain, nail deformity, and spread to other nails or skin.
Common Symptoms
Yellow, brown, or white discoloration of nails
Thickened, brittle, or crumbly texture
Nail separating from the nail bed (onycholysis)
Foul odor or buildup under the nail
Pain or pressure when wearing shoes or using hands
When to see a dermatologist
Persistent nail discoloration or thickening
Infection spreads to multiple nails
Pain, swelling, or pus around the nail
You have diabetes or a weakened immune system
Over-the-counter treatments are ineffective
Early detection is important for managing the condition and preventing further complications.
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