&chief_complaint=Tender red bumps on the legs and pain and swelling of involved joints

&phys_exam=Tender erythematous subcutaneous nodules on the legs and tenderness and swelling of the involved joints

&cor_dif=Sarcoidosis,Loefgrens Syndrome,Enteropathic Arthropathy,

&incor_dif=Systemic Lupus,Progressive Systemic Sclerosis (Scleroderma),

&review=differential diagnosis of Ankle Arthritis and Erythema Nodosum