A very thin and very long white hair on the body may just be simple pigment loss, or it may be due to bad habits, vitiligo. 1. Simple pigment loss: for example, once had a rash, eczema, etc., easy to lead to local hypopigmentation; or due to long-term exposure to ultraviolet light, resulting in melanin loss. 2. lifestyle habits: unhealthy diet, late at night, too much pressure, mental tension and other bad habits, affecting tyrosinase activity, the hair can not form melanin, can make the local hair white. 3. Vitiligo: usually associated with genetic as well as autoimmune factors, when a large amount of pigment loss, it will lead to local skin whitening, local hair pigmentation will also be lost. A white hair on the body, may also be unreasonable diet, skin injury caused by hair follicle victimization, specific should be analyzed under the guidance of a professional physician cause, carry out regular treatment.