White toenails are also clinically known as onychomycosis, commonly known as gray nails, and are mainly a disease caused by dermatophytes invading the nail plate or under the nail. The clinical manifestations are superficial white nail fungal disease, mainly one or more small cloudy areas on the surface of the nail plate, irregular in appearance, which can gradually spread to the entire nail plate, resulting in a softening and sinking of the nail surface, without any symptoms, without nail fungus, commonly appearing scaly at the skin of the nail bed wrinkles. This situation is recommended to do fungal culture or microscopy, after the diagnosis of drug treatment, the current choice of drugs are oral terbinafine or itraconazole, can be used topically tincture of hygroscopic or clotrimazole solution, etc. for treatment.