Foot Fungus Infections. As the fungal infection goes deeper, nail fungus may cause your nail to discolor, thicken and crumble at the edge. Often, these infections appear as itchy, scaley, rashes on the skin.
Fungal nail infections develop when your feet are constantly warm and damp. Potentially more dangerous fungal infections that invade deeper structures of the skin or organs in the body called deep fungal infections. Tinea pedis is a foot infection due to a dermatophyte fungus.