A long white hair on the body can be caused by nevus, hypopigmented skin disease, inflammatory skin disease and other factors. 1. pigmented nevus: some pigmented nevus can appear on the surface of long hairs, especially long white hairs, which may be related to the loss of pigmentation of local hair follicles at the white hairs. 2. Hypopigmented dermatosis: hypopigmented dermatosis can be divided into congenital or acquired diseases, prone to leukoplakia skin damage, the surface of the white hairs can grow, can occur in all parts of the body, manifested as white skin on the basis of white hairs. 3 inflammatory skin diseases: inflammatory skin diseases can also make the local skin white patches of performance, in the white patches on the basis of the hair follicles due to the occurrence of pigment granules or pigment cell loss, can be manifested as a local growth of a long white hair performance. When a long white hair grows on the body, you should consult a doctor in time, under the guidance of a specialized doctor to actively carry out appropriate treatment, which will help to alleviate the uncomfortable symptoms as soon as possible.