White patches on legs may be caused by conditions such as pityriasis alba, anemic nevi or vitiligo. 1. Leukofuria: Leukofuria is a common skin disease, the main symptom is the appearance of round or oval white spots of different sizes on the skin, indicating the visible chaffing flakes. White chaff rash can be self-healing, daily need to keep the skin clean, do not over wash. 2. Anemic nevus: Anemic nevus is a disease caused by congenital skin blood vessel abnormality, which will show single or multiple irregular pale white spots. Anemia nevus develops more often in childhood and generally does not require treatment. 3. Vitiligo: Vitiligo is usually a skin and mucous membrane pigmentation deficiency disease caused by melanin loss, and the symptoms are irregular white spots on the skin. Because vitiligo is more affecting the appearance, and the condition is not easy to cure. It is recommended to consult the doctor in time, under the guidance of the doctor to actively carry out the treatment. The white spots on the legs may also be caused by other reasons, it is recommended to go to the hospital in a timely manner to identify the cause of the disease and then treat the symptoms.