Nail fungus consists of an infectious mushroom. It generally yellows, thickens, and deforms the nail. It’s an infection that manifests itself slowly and damages the nail progressively.
All nails that have yellowed or thickened are not necessarily caused by nail fungus. A thick or yellow nail may be caused by an injury that affects its growth, deforms it, or thickens it. Nail fungus must not be confused with other nail diseases, such as psoriasis, lichen planus, melanoma, or cardio-pulmonary diseases.