Psoriasis herbal remedies, Qing Dai (Indigo Naturalis).
A 2005 study of powdered indigo mixed in an ointment showed improvement in plaque psoriasis, and concluded that “Topical indigo naturalis ointment was a novel, safe, and effective therapy for plaque-type psoriasis”.(Yin-Ku Lin, MD; Chee-Jen Chang, PhD. Clinical Assessment of Patients With Recalcitrant Psoriasis in a Randomized, Observer-Blind, Vehicle-Controlled Trial Using Indigo Naturalis. (2005), Journal Watch Dermatology 2008;2008:3-3) Powdered indigo can be found at shops that carry Chinese herbs, and ready-made ointments are also available.