Welcome @joeblo746, I think long term use of prednisone can cause thin skin along with some itching. My PMR is in remission but I can remember some itching of my arms but I don't think I ever had the rash or red splotches like your symptoms. Hopefully others can comment and share what has helped them. Now days because I still have some itching skin and it's thin, I easily bruise and get small skin tears that bleed easily. What helps me is to use a daily moisturizer on the skin like Eucerin or similar lotions.

Have you discussed the symptoms with your doctor to see if they may have some suggestions?

I have that same problem. If I get an itchy spot and scratch it, I almost always end up with a red/purple splotch. They take weeks to fade away - so I try very hard not to succumb to the itch cycle. I blame it on the prednisone.