Toenail fungus infection is a type of infection that develops underneath the toenail, right on top of the skin. It can strike at anyone regardless of age but is more prevalent among older men. Several types of toenail fungus are caused by various microorganisms such as yeast or mold. The most common cause of this, however, is the group of fungi known as dermatophytes.
The medical name of toenail fungus infection is dermatophytes. Its most common symptoms include having brittle, split, cracked, ragged, or crumbly nails; the nails have distorted shapes; the nails may also become yellowish, greenish, or brownish; the infected nails may lift off the nail bed; the nails may thicken and hard to trim, and the nails may give off a foul smell too.