I had a bilateral SI joint injection into my back, plus 3 other cortisone injections at other locations on my spine at the same time 2 days ago started feeling bad last night, feeling bad all day today and broke out into a rash at forehead, neck, behind and in ears sometime today, Also have itchy feelings at other body areas, my upper back, my nose has rash and itches too. Also I am itchy and experiencing slight intermittent itches at localized areas on the trunk of my body. Could this be an allergic reaction to the cortisone?