This is a randomized, placebo controlled, double blind study. Following a screening period of up to 28 days, subjects with active systemic lupus erythematosus (SLE) including moderate to severe rash and/or arthritis despite corticosteroid therapy will be randomized in a 1:1 ratio to receive 1 mL (80 Units [U]) of Acthar or matching placebo. During Weeks 1 to 4, 1 mL (80 U) of Acthar or volume matched placebo will be administered subcutaneously (SC) every other day. For the remainder of the study (Weeks 5 to 24), Acthar 1 mL (80 U) or volume matched placebo will be administered SC 2x/week.