I have had a psoriasis for 15 years. I used home treatment which i learned from botanic expert Phd. İbrahim Saracoglu on TV and it worked for me. It consists of two ingredients; Black Cumin Seeds and Yogurt. I think yogurt is used only for good taste. You make mixture with one little spoon of black cumin seeds with one cup of yogurt. You eat this mixture in morning. In afternoon same process and eating. After some weeks all psoriasis plagues are removed. It worked for me and i hope it will work for you. Please give it a try.
Because of wrong translation i edited my original post.