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Optimizing the frequency of outpatient short‐contact dithranol treatment used in combination with broadband ultraviolet B for psoriasis: a randomized, within‐patient controlled trial

Background  Recent concerns over the side‐effects of psoralen plus ultraviolet (UV) A, immunosuppressive and cytotoxic treatments have led to increased interest in dithranol for treatment of psoriasis. Few studies have investigated how frequently dithranol should be applied. Dithranol‐induced inflammation is maximal at 48–72 h, suggesting that daily application of dithranol may not be optimal.