A little white on the nails consider trauma, gray nails, psoriasis and so on. 1. Trauma: If the nail area is slightly traumatized, it will cause damage to the epidermis of the nail, at this time, the inside of the nail will be white, usually with the growth of the nail will move to the distal end, and then gradually disappear. 2. Gray nails: gray nails, also called onychomycosis, is a nail lesion caused by the skin fungus invading the nail plate and nail bed, in the beginning, the nail plate will become cloudy, and then there will be some white on the nails. 3. Psoriasis: the cause of psoriasis is not particularly clear, mainly skin manifestations of the main, but if the lesions invade the nails, there will be a thimble-like or point-like depression, in the beginning there will also be a little white on the nails. There may be other reasons for a little white on the nails, it is recommended to go to the hospital in time, improve the examination to clarify the cause of the disease, and then give targeted treatment or treatment.