Onychomycosis, otherwise called tinea unguium, is a fungal infection of the nail. The infected nail might look white, opaque, thickened, or brittle. The other symptoms include:
- White or yellow nail discoloration.
- Thickening of the nail.
- Separation of nails from the nail bed.
- Both toenails and fingernails can be affected, but toenails are the most commonly affected.