It can also remove abnormal mucus, improve the microcirculation of the lesion skin, replenish trace elements, improve the photosensitivity of the skin, and also promote the formation of melanin in the skin, thus treating vitiligo. The tincture of compound kalizarin is a topical preparation, usually this drug is applied to the affected area, 30 minutes after the application of the drug need to be topical sunbathing, or ultraviolet radiation for 15-30 minutes. It should be noted that during the use of the drug, foods such as fish, shrimp, wine, green beans and tomatoes should be prohibited to avoid affecting the effectiveness of the treatment. When using this medication, you should always sunbathe or take a black light to keep the affected skin pink. If any adverse reaction occurs during the application of the medication, you should seek medical attention.