Picture of Onychomycosis (Fungal Nail Infection) Onychomycosis: Fungus infection of the nail bed under the fingernails or toenails. Onychomycosis makes the nails look white and opaque, thickened, and brittle. It usually produces no symptoms other than a cosmetic problem.
There are many different causes of fungal nail infections, and
each cause has a treatment of its own. Although many of the causes of a fungal
nail infection are preventable, some risk factors increase the likelihood of
developing it. You’re more likely to develop a fungal nail infection if you: