Small vessel vasculitis can be very benign and not require treatment, or it can be the harbinger of more serious involvement in the kidneys, gut and other organs. The treatment really depends on which of the two your picture fits. If the first, the prednisone might do more harm than good. If the second, you might need something stronger such as an immunosuppressive drug. You will need to discuss this with your rheumatologist. good luck.