I have vasculitis, but my prednisone keeps it under control very well. It's inflammation of your blood vessels. One key symptom or sign of vasculitis is something called "splinter hemorrahges". If you look at your fingernails and see small brown lines in them. That is a clear sign of it. Another symptom is headaches, and other skin discolorations. I have one called livido reticularis. On my wrist and ankle.
I hope this helps.