I know what your talking about with psoriasis. It is probably candida (overgrowth of yeast) but Serrapeptase (amongst a lot of other things) eats/gets rid of candida which intern will eliminate psoriasis. Also diet helps me greatly with Serrapeptase (no carbs) (little-no sugar.....and that doesn't mean substitute that with Sugar alternatives)
http://www.swansonvitamins.com
has higher doses of serrapeptase. When you go to higher MG or IU then you might have some minor achy feelings in places but the Serrapeptase is doing its job and eating away the fibrin from either old injuries there etc.