I've suffered from bad Psoriasis for about five years.I could hardly use my hands! After using steroid ointment it got much worse. My groin and head were covered in psoriasis. My consultant prescribed methatrexate which I refused, as I've read so many reports on the side effects.
I read about how nightshade vegatables can trigger psoriasis, so four months ago I cut out all 'nightshade ' foods. eg potatos, tomatos and eggplant. I also have been taking 1000mg cod liver oil every morning for four months. My skin is so much better, almost completely clear.