My Psoriaosis isn't too bad so I'm not too sure about that, but last year someone reccomended going on a sunbed to clear my acne up before I was a bridesmaid at my sisters wedding.
It wasn't a wonder cure and I wouldn't do it long term because of all the obvious dangers of using a sunbed but it did seem to help. It dried my skin up a bit and also made them less noiticable becuase of the tan.
I wouldn't do it all the time but if it was for a special occasion I would definitely try it again.
Love Willow xx