hi,
I am from India. Psoriasis is not that common here. Still I have heard stories of people curing it.
Here is how.
1) Most do swami Ramdev's pranayama. You can get his dvds form here:
http://www.swamiramdevyoga.com/vcd-for-ski...ases/index.html
He has a special program for skin diseases. One of my dad's friends partially healed from life
long leucoderma.
He is a very accomplished yoga guru in India. Don't worry, he is not a phony.
2) Try homeopathy. I use the homeopathy of www.drbatras.com. They have pictures in their clinics of people getting rid of psoriasis.
3) Qigong, microcosmic meditation should help. I am not an expert on this topic. There are other luminaries on the forum who know much more.
cheers
Smruti