Nail fungus, also known as onychomycosis, is a common fungal infection that affects the toenails or fingernails, causing them to become thick, brittle, discolored, and sometimes painful. It develops when fungi invade through small cracks in the nail or surrounding skin, thriving in warm and moist environments such as sweaty shoes or public showers. Early signs include yellow or white ... https://zanaquick.com/blogs/news/what-is-nail-fungus