I have psoriasis, and It sucks. Seems for me, I have it on my scalp, both knee's (one more so than the other) and my elbows. The only thing that helps me is swimming in a pool with chlorine. But with me being so fat, I don't want to go swimming, so I haven't. My knee's is really bad. Last summer my psoriasis caused me to have an infection, and it scarred my lower left leg alot. :/