How To Trest Itchiness Behind Knee,breasts And Neck Inspite Of Taking Steroids?

I am having intense itching behind my left knee and my neck and my breasts. I was on a round of steroids, tramadol, and prescription nsaids. That was prescribed on 12 11 14. No issues until Sunday 01 04 15. Went on 01 05 15 to urgent care with intolerant itching. Put on another round of steroids also with a shot of steroids. No new foods. Itching went away now back again with a vengeance. Ta king benadryl what could be wrong.