Gray nails generally refers to onychomycosis, hang up the dermatology to see, patients need to take medication, surgical treatment. Nail fungus is caused by dermatophyte infection, the nail plate will appear uneven, gray and yellow turbidity, nail plate thickening, nail plate breakage and other manifestations, it is recommended that patients can hang up dermatology treatment. Patients can use 30% glacial acetic acid solution, 5% tincture of iodine and other topical treatment under the guidance of the doctor, some patients also need to follow the doctor’s instructions oral itraconazole, terbinafine and other antifungal drugs. In addition, patients need to take nail extraction treatment when necessary. Due to the contagious nature of onychomycosis, it is recommended that patients with gray nails need to consult a doctor in a timely manner, so that they can choose the appropriate measures for treatment under the guidance of the doctor. In addition, due to the differences in the departments of each hospital, the patient needs to go to the local hospital to consult which department to hang up for treatment.