The causes of white hair on the lower body may be related to genetic factors, as well as micronutrient deficiencies and vitiligo. 1. Genetic factors. The color of the hair and the density of the hair have a certain genetic influence, for the family has body hair white people, the lower body hair white chance will be higher. 2. Trace element deficiency. Copper, iron, zinc, phosphorus and other trace elements, can participate in the formation of melanin, so it can also directly affect the color of the hair, when the body of trace elements lack of the phenomenon may appear white hair. 3. Vitiligo belongs to a kind of acquired pigment deficiency disease, in the onset of white spots, hair will appear white phenomenon. As a result of the influence of many factors, the specific circumstances need to first ask the doctor for a face-to-face diagnosis.