White patches on the nail cover may be related to factors such as onychomycosis, calcium deficiency as well as trauma, etc. In terms of treatment, antifungal, dietary modification and surgical treatment need to be given respectively. 1. ringworm of the nail: also called gray nails, is due to the nails infected with ringworm and a lesion, due to the ringworm will directly cause damage to keratin, so in the clinic may lead to nail plate thickening, discoloration, and warping of the shell and other phenomena. The main treatment is to give anti-fungal drug therapy, such as external amorolfine application, oral itraconazole dispersible tablets and so on. 2. Calcium deficiency: Calcium is an important element to maintain the normal growth of human body, when calcium deficiency will affect the normal growth of nails, make nails become brittle, discoloration and so on. 3. Trauma: After the nail plate is affected by some trauma, it may lead to abnormal nail growth, and some white spots or thickening phenomenon may appear. Due to the different causes, the treatment will also be different, the specific situation needs to be evaluated by a doctor before choosing the appropriate treatment.