The only solution I've found for my psoriasis is sunshine. Soon as spring has sprung and I can get a day in the boat with no shirt fishing for Crappie, mine goes away. I've also had success with tanning beds, but I'd almost rather have psoriasis than lay in one of those things where others junk has dangled.
Sunshine doesn't make mine go away. It started as a relatively small patch a few years ago. Now I'm in the process of becoming a mineral.