I have discoid lupus & panniculitis. may i know what explains my constantly elevated igg level (~2000)? i also have lymphopenia due to steroid intake.

Just a bit high: That's not surprising in systemic autoimmune disease where there's often a polyclonal gammopathy. We don't usually treat discoid lupus with systemic glucocorticoids, and I'm wondering what the panniculitis is really about (Weber-Christian?). You may have some alternative to long-term steroids, which are brutal. Perhaps you can get a second opinion / clarification.