A very long white hair on the face may be caused by heredity, vitiligo, depigmentation spots and other factors. 1. Heredity: Parents single or both, grandparents in the family, appeared similar situation, affected by genetic factors, their children may appear white hair on the face. 2. Vitiligo: Vitiligo is relatively common in clinical practice and is an acquired pigment loss skin disease. If vitiligo occurs in the face, resulting in localized hair follicle pigment loss, the above situation may occur. 3. depigmented patches: localized external forces, resulting in pigment loss, causing depigmented white patches. The melanin in the affected area is damaged, and white hairs can appear. If it is caused by physiological factors and the patient has no other uncomfortable symptoms, it is recommended to closely observe. If it is suspected to be caused by vitiligo, it is recommended to go to the dermatology department of the hospital for consultation and targeted treatment.