Nail fungal disease is most often transmitted directly from tinea capitis. Susceptibility factors include genetic factors, systemic diseases such as diabetes, localized blood pressure, or lymphatic drainage disorders, nail trauma, or other nail diseases. Nail fungal disease, which accounts for about 30% of dermatophytoses. About 50% of patients with ringworm have nail fungal disease, and the prevalence increases with age. Depending on the location and degree of fungal invasion of the nail, it can be divided into the following types. 1. White superficial type The pathogenic fungus invades directly from the surface of the nail plate and is manifested as a dotted or irregular irregular patch of the superficial nail plate with white turbidity. The surface of the nail plate loses its luster or is slightly uneven. 2.Distal lateral sub nail type This type is the most common, mostly spread by tinea pedis, the fungus from one side of the nail contour, invade the distal front and side edges of the nail and make it thicken, slightly yellow turbid, the surface of the nail plate uneven or broken. 3, proximal nail type fungus through the small nail skin and into the nail plate and nail bed. It shows as rough and thickened nail half-moon and nail root, uneven and broken. Total nail destruction type is the final result of the development of each type of nail fungal disease. The whole nail plate is damaged, grayish-yellowish-brown, the nail plate is partially or completely lost, the surface of the nail bed remains rough keratinized accumulation, the nail bed can also be thickened and flaking. Treatment: 1. Topical medication is often used for superficial and simple distal damage that does not involve the nail root. First remove the diseased nail as much as possible with a knife or nail file, then apply 30% glacial acetic acid solution or 3%-5% tincture of iodine twice a day for 3 to 6 months until a new nail grows. Can also be used 40% urea ointment sealing package when adding softening peel, and then topical antifungal preparations. 2, systemic drug therapy Itraconazole intermittent shock therapy (400 mg per day, divided into two oral, monthly dosing for a week as a course of treatment. (Nail involvement requires two to three courses of treatment, toenail involvement requires three or four courses of treatment.) Terbinafine 250 mg daily by mouth continuously for 6 to 8 weeks.