What Causes Swelling With Blood Clot In Wrist And Ankle?

Hello doctor. This is parvathy. My wrist ankle got SWOLLEN, and the doc said I m suffering from autoimmune vasculitis for which the cause has not been identified. Wrist and ankle not just swollen with blood clot, but was unable to move my fingers and toes. For past 25 days I have been given steroid dose 8 mg to reduce the swelling and blood clot. Now I m scared that I might be asked to take the dose for longer period without identifying the cause. I underwent cesarean and I have three months old kid. Please help me out.