Gray nails form mainly due to lesions caused by fungal invasion of the nail plate and nail bed. Gray nails, also known as nail fungus disease, is mainly caused by the nail plate, nail bed and other parts of the fungal infection, such as red trichophyton, ringworm trichophyton, Candida and some molds and so on. In some cases, it is caused by fungal infections of the fingernails or toenails after trauma. The patient’s diseased nails usually have symptoms such as turbidity, thickening, separation, discoloration, atrophy, detachment, buckling, uneven surface, hooked nails, etc. Often accompanied by onychomycosis, which may lead to pain in patients with more serious symptoms. It is recommended that patients actively cooperate with the doctor for treatment, the treatment cycle may be longer, patients must adhere to long-term compliance with the doctor’s prescription medication.