The difference between pityriasis alba and vitiligo lies in the different causes, different locations of attacks, different symptoms and so on. 1. different causes: white furfura may be related to microbial infection, malnutrition, vitamin deficiency, sun exposure and other factors. Vitiligo may be related to heredity, autoimmune system diseases, neurochemicals and other factors. 2. the location of the attack is different: white chaffeas is good in the face, neck, shoulders and other locations. Vitiligo occurs in exposed, friction and skin folds, such as the face, neck, back of the hands, fingers, armpits, wrists, forearms, abdomen and lumbosacral areas. 3. Symptoms are different: white chaff rash lesions for the initial erythema, with the development of erythema subside, appearing mildly hypopigmented pale spots, the surface is covered with dry chaffy scales. Vitiligo manifests itself as white patches on the skin, with the center of the patches usually white in color and the surrounding skin pale white. When white patches appear on the skin, it is recommended that the patient actively go to the hospital for consultation, by professional doctors through the observation of the symptoms of skin lesions and examination results to clarify the cause of the disease, and then give targeted treatment.