Examples
Fungal toenails are toenails that have become infected with one of a group of microorganisms we call fungus. In many instances it is the same organism that causes athlete's foot. As the fungus invades the nail and the nail bed, it may go unnoticed for a period of time because it is rarely painful. It usually appears at the nail edge and works its way under the nail, progressing back to the root of the toenail. Once it invades the root, or matrix, it begins to distort the way the nail grows and becomes more difficult to treat.
