Nail fungus infections are the most common diseases that affect both the toenails and fingernails. These infections make up about 50 percent of all nail abnormalities. Fungus naturally grows in the body, but it becomes a problem when it overgrows. Nail fungal infections are also called onychomycosis and tinea unguium.
Fungi are microscopic organisms that can’t be seen by the naked eye. The most common group of fungi that causes nail fungus infection is known as dermatophytes. The fungus does not need sunlight to thrive. On the other hand, yeasts and molds may also cause nail infections.