Girls with gray hair may be caused by malnutrition, genetic factors, vitiligo, mental psychological factors and other reasons. 1. Malnutrition: Hair growth and development is closely related to zinc, vitamins, folic acid and other nutrients, if the girl is malnourished, may grow white hair. 2. genetic factors: for example, albinism, is a genetic disease due to gene mutation, in addition to white hair, will be accompanied by skin, under the eye and other places of pigment loss. 3. Vitiligo: When you have vitiligo, the main manifestation is the appearance of large and small white spots on the skin, and the hair will also become white. 4. Mental and psychological factors: if the child is under too much pressure in study and life, he or she may also grow white hair. If the girl grows white hair, it is recommended to go to the hospital in time, do the relevant examination for targeted treatment.