After awhile these medications don't work and we have to try new ones. Do you see rheumtologist? If not, it might not hurt to get an opinion from one. My cousin was on remicade for quite awhile to treat her sarcoidosis andwhenshe had to stop the infusions she broke out in the worst case of psoriasis I have ever seen - coverd from head to toe.
I have psoriatic arthritis but never had a skin problem till I had a remicade infususion. broke out in what looked like psoriasis so didn't stay on it. Monday I am going for a lung biopsy as a recent CT scan showed nodules in both lungs as well as my lymph nodes. I am scared to death. All of my doctors think it is sarcoid disease but can't be sure until they rule out cancer, etc. I had started on Cimzia but had to stop because of the upcoming surgery, so I've been on prednisone for the last month or so. My biggest fear is getting an infection. These drugs that lower our immune systems are so scary but we don't really have a lot of choice if we want any quality of life. Some day, not in my life time, they will figure a way to change the entire immune system.
best of luck