This sounds as if he has been taking either enbrel or humina. each one of these drugs comes from a shot given to yourself once or twice a week depending on your doctors recemdation.
Do these med's help?...yes they do for a short period of time. Does Psoriasis come back after you stop taking these shots?...yes it does. Does your body get messed up from these medicines twice a week for the rest of your life?..you better belive it.
I have been the test baby for the state of michigan when it came to new medication just released by the FDA. I was on meds that no one else even heard of before...nothing will work unless you change your life habits.
Eat the proper diet for Psoriasis, drink lots of water..liver and kidney cleaning. give up on the sugars and starchs. Try to see what your body is tell you waht is wrong.
These medications the Doc's are pushing right now are only tempary fixes. It will come back once you stop taking them. I will tell you right now, they hurt to use and your body will be a pin cushion when your done.
I have cleared my Psoriasis with proper diet and cleansing after being on meds for the last 20 some years.
There are many great people on the site with good knowledge on how to heal yourself naturally.