Onychomycosis means fungal infection of the nail. It's the most common disease of the nails and constitutes about a half of all nail abnormalities. This condition may affect toenails or fingernails, but toenail infections are particularly common. The prevalence of onychomycosis's about 6-8% in the adult population. Onychomycosis caused by dermatophytes's also known as tinea unguium (tinea of the nails). Symptoms The nail plate can have a thickened, yellow, or cloudy appearance. The nails can b… (More on Onychomycosis)