There are many reasons for children to have white spots on their nails. Generally, it is considered to be caused by fungal infections, trauma, lack of micronutrients or malnutrition of the nails. 1. Fungal infections: when the nails are infected by fungi can lead to white spots on the nails, and in severe cases may also lead to gray patches on the nails. 2. Trauma: when the nails are hit by external forces or gravity extrusion and other reasons, there will be white spots on the nails, accompanied by local bruising, redness, swelling and pain. 3. Lack of micronutrients or nail malnutrition: when children are too picky eaters or often eat snacks can lead to malnutrition, the children appear after malnutrition can lead to micronutrient deficiencies, as well as the occurrence of nail malnutrition, there will be white spots on the nails. Need to go to the hospital to confirm the cause of the diagnosis of targeted treatment, can not be randomly used drugs.