Fungal nail infections typically begin as a small spot under the nail, usually at the tip. Over time, the fungus grows deeper, causing discoloration, thickening, and crumbling edges. The main culprits are dermatophytes, a type of fungi that thrives in warm, moist environments such as locker rooms, showers, and sweaty shoes. Yeast and molds can also cause nail infections. https://zanaquick.com