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Anthralin is another topical medication that works by slowing down your body’s production of new skin cells. It helps remove psoriasis scales and makes your skin smoother. Anthralin can stain your skin and clothing brown or purple, so you might leave it on for 15 to 30 minutes and then wash it off. This type of short-contact treatment is called SCAT, which stands for short-contact anthralin therapy. Anthralin does not work as well on very active psoriasis.