Crohn's and Psoriasis

Hello, I have had crohns for the past 12 years. 2 1/2 years ago was put on remicade after a bad flare up. I got pregnant after a year and remained taking it till last trimester, when I went of of it I have developed rash on stomach and arms. It was itchy and dr thought it was pregnancy related. Dr took blood test and it showed I had cholestasis of pregnancy which went away when my baby was born. My rash did not go away, it only got worse. I had complications with csection and some infection all before I went back on remicade. Anyhow, I was finally put back on it but surprisingly it wasn't working the same either for crohns or ps. Biopsy was taken and confirmed ps...doctors thought that remicade would help but not really. Now, I'm doing photo therapy since I'm breastfeeding I can't be on strong meds and as for crohns I'm still on remicade but my dr wants to put me on humira.
I have never had psoriasis before so I'm really upset and stressed over this. I have rash on my stomach and bad on arms and shoulder. I've had 7 light treatment it got redder, flared and itchier. I don't know what else is safe to take or do. Diet is difficult as I'm still nursing but am following a healthy eating.

Is there anyone with a similar experience. I would very much appreciate a feedback please.

Thank you Sherry for your reply. OTC cream..is that prescribed by a doctor? Will it clear the rash? Will it come back when I stop using it?
Doctor is doing colonoscopy this Monday to see if my crohns is active and than I'll get tested for antibodies. That's so upsetting to get another autoimmune disease caused by a medication..so bad:(
Do you think if I start humira that it'll clear ps? Or It'll cause something else...it's so disappointing to know what can help safely.

Thank you:)