Toenail fungus infections occur when microorganisms called fungi to begin to grow and spread under the toenail. A fungal infection requires medication. Toenails are susceptible to fungal infections because the environment inside your shoes is perfect for fungal growth. Fungus thrives more in a dark, warm, and moist environment.
There are several common symptoms of a nail fungal infection. It may start as a white or yellow spot underneath the tip of your nail. Then it may lead to nail discoloration, dull and thicker toenails, brittle nails with jagged edges, nail shape distortion, bad smell from the nail, pain, and the nail separating from the nail bed.