hi, simonr have suffered p. pa from a early age now 53
and like you are still looking for a cure. you name it iv'e tried it, m-folia somethings work for some and for people like us it dont. puva worked for but thats another story
iv'e tried things you woulden't belive. i have crohn's
ankylosing spondylitis and the p.& pa as attacked my rib cage heart, lungs stomach etc. you say you are on mtx
surf the net, ask your derm&reuhmy the mtx &folic acid
are no good on there own should be with others,
any way all the best and dont give up, at the mo theres no 100% cure for every body.unless there some one who knows better.