I know your pain Nick as I suffer from psoriasis.
At the moment I've got it on the inner ear channel, which means its damn itchy all the time and no matter what I try it will not clear up... as yet.
It's clearing up from on my head where it is usually located, but there was 1 time when I was 16 when I woke one morning to what looked like chicken pox. Within a few days it was apparent that it was not chicken pox but psoriasis gone mad and I had to have various trips to hospital to be wrapped in bandages with some coal tar ointments etc soaked into them. Oh how I must have looked then, I bet people thought I was a mummy for 4 weeks
Funny thread as usual fella - had me giggling at most parts