Keywords: CZP, certolizumab pegol; MTX, methotrexate; PSL, prednisolone; RA, rheumatoid arthritis; RV, rheumatoid vasculitis; TNF-α inhibitor; TNF-α, tumor necrosis factor-alfa; autoimmune disease; biological therapy; certolizumab pegol; leg ulcer; rheumatoid arthritis; rheumatoid vasculitis; skin ulcer.