Hi @microbe1943, You will notice that we changed the title of your discussion to better describe your question and hopefully bring members with experience into the discussion. I have had 2 occurrences of PMR but it is currently in remission. I have occasionally had itchy skin but not sure I could say that prednisone is the cause. Prednisone does have some long term side effects, including thinning skin and weight gain. There is an allergic reaction warning on prednisone that it can cause trouble breathing, swelling of your face, tongue, or throat
red, and itchy rash that affects one or more patches of skin.

"Allergic reaction warning. Prednisone oral tablet can cause a serious allergic reaction in some people. This reaction can cause a skin rash, which can include:." -- Prednisone: Side effects, dosage, uses, and more: https://www.medicalnewstoday.com/articles/prednisone-oral-tablet#other-warnings

Have you discussed the itching and red inflammed skin patched with your rheumatologist?