They are also known as onychomycosis and tinea unguium. Both fingernails and toenails are susceptible to infection, which ...

Medically reviewed by Danielle McNeil, D.P.MMedically reviewed by Danielle McNeil, D.P.M There are three main types of toenail fungal infections, also known as onychomycosis or tinea unguium ...

Onychomycosis, or fungal infection of the nail, most often affects the toenails. Infected nails usually have a thick, yellow appearance and can become coarse and brittle (see Figure 4). When ...