Nail head, i.e., the distal end of the nail has a white edge, may be linear leukonychia, nail fungus and other causes. 1. linear leukonychia: linear leukonychia may be related to heredity, vitamin deficiency and other factors, often occurs in the half-moon part of the nail, with the growth of the nail moved to the head of the nail, manifested in the nails appeared transverse or longitudinal white stripes, varying in width, and will not appear to fade when the nails are pressed. 2. Onychomycosis: Onychomycosis is a nail lesion caused by dermatophytes invading the nail plate or nail bed. When the fungus invades directly from the surface of the nail plate and is located in the superficial layer of the nail plate, the nails will appear opaque, white spots with clear edges or transverse grooves, and at the same time, the nails will appear cloudy, thickened, separated, atrophied, detached, and the surface of the surface unevenness and other symptoms. Nail head with white edge may also have other causes, it is recommended to go to the hospital in a timely manner to improve the examination, to clarify the cause of the disease and then give targeted treatment.