Hi, I'm listed as a new member, but actually have been on the forum since 2009. so welcome. My experience with Psoriasis is this: First of all, I actually got mine from having a pedicure, and the guy using the emory stick, practically fell asleep while he did my heel. This caused trauma to my heel, and that is the only place I have ever had it. (for that I am blessed and as I read some of these posts, I feel so sorry for those with horrible cases). I had mine biopsied and it is Pustular Psoriasis, makes little blister like things and then they pop after I spray them with Skin Solution zinc spray. This causes them to open faster and then form a scab and eventually they fall off and I'm good to go for a while.
I know we are all different and what works for one, doesn't work for the other. I have found that whipping cream and eggs are culprits. I have, like you all, tried every cream on the market and a couple of the less expensive prescription ointments. They will all work for a while, and then like someone said, if you have autoimmune diseases, (which P, is) then it turns against you. My best success has been coconut oil, when that stops, I go to a mixture of olive oil/peanut oil, half and half. they work the best. Plus soaking my foot in epsom salts, or dead sea salts. I pray you can all find something that works and check your diet. God bless you all, lele77