White lumps on the nail cover may be caused by fungal infection, and may also be caused by trauma or malnutrition, which need to be analyzed specifically. 1. Fungal infection: nails may appear white lumps after infection with fungi, this is due to the invasion of fungi from the surface of the nail plate, the inner part of the nail plate white spots and expanding, causing unevenness and discoloration of the nail plate, etc., you can follow the doctor’s instructions for antifungal treatment. 2. Trauma: After the nail plate is stimulated by trauma such as extrusion and collision, the nail plate will appear white, generally without special treatment, with the growth of nails, the white block will gradually subside. 3. Malnutrition: the body due to picky eating and other nutritional deficiencies, input into the nail nutrition will become less, when the nail lack of certain trace elements or vitamins, the growth of the nail matrix is affected, so there will be a white block. If the symptoms of white lumps on the nail cover are serious or continue without improvement, you should go to the hospital in time for treatment.