If a small white spot appears on the nail occasionally, without significant expansion and other symptoms, it may be directly related to the occasional trauma to the nail, and the patient does not need to deal with this situation. It will disappear on its own after a period of time and will not affect the normal health of the person. However, other patients who have visible white patches on their nails, and the white patches are gradually expanding, and the shape of the nail itself has changed significantly, should be highly alert to the possibility of a fungal infection, which is a condition known as gray nail. In other cases, extensive white spots on the nails may be caused by nail dystrophy. For fungal infections and nail dystrophy, patients should go to a regular hospital dermatology department and ask a doctor to identify the condition.