Toenail fungus, also known as onychomycosis, is a common infection that causes the nail to become discolored, thickened, and brittle. It often begins as a white or yellow spot under the tip of the nail and can spread deeper if left untreated. Warm, moist environments like sweaty shoes can promote its growth. Early treatment can help prevent the infection from worsening. https://zanaquick.com/blogs/news/what-is-the-fastest-way-to-cure-toenail-fungus