You can determine if the white patches on your face are vitiligo through symptoms and examination. 1. Symptoms: Vitiligo is usually manifested as one or several patches of different sizes, usually milky white or porcelain white and the border between the surrounding skin is relatively clear, and there is no itching and other symptoms, the patches may be round, oval or irregular shape. 2. examination: if suspected of vitiligo, mainly through the examination to confirm the diagnosis, you can carry out histopathological examination, commonly used in atypical vitiligo, manifested in the epidermal melanocytes and pigment granules at the white spots are completely missing. Vitiligo also needs to be examined by Wood’s lamp, which can distinguish vitiligo from some other skin diseases. If in the progressive stage can be gray-white fluorescence, the border is not clear; if the stable stage is blue-white fluorescence border is clear, there will also be islands of pigment or edge pigmentation. Vitiligo also requires dermoscopy, reflective confocal microscopy, and antibody testing to confirm the diagnosis. If the symptoms of vitiligo as well as the examination results are abnormal, you should consult the doctor in time and treat it as soon as possible to reduce the adverse effects of the disease.