Australian authors of a systematic review have concluded that topical herbal medicines (HMs) provide additional benefit to psoriasis patients when used in combination with pharmacotherapy. Eight studies met their inclusion criteria. All used multi-herb formulas, four in herbal baths, three in herbal ointments or creams and one as herbal steam. The pooled data indicated a benefit for the adding topical herbal therapy to anti-psoriatic pharmacotherapy. Experimental studies suggest that some of the herbs possess anti-inflammatory, anti-pruritic and/or anti-proliferative activities. (Topical herbal medicine combined with pharmacotherapy for psoriasis: a systematic review and meta-analysis. Arch Dermatol Res. 2013 Apr;305(3):179-89).