"Lupus erythematosus differs from rosacea in onset, flushing history, distribution, and general medical history. Lupus presents acutely with a livid color with sharp margination. Unlike rosacea, flushing and papules are usually not present. Also, antinuclear antibody evaluation can help differentiate lupus from rosacea. Lupus would be suspected with an elevated titer level."

Good comparisons with other diseases at the bottom, Rhap:

http://www.nursingcenter.com/prodev/...asp?tid=601568

I'd be careful about the "lupus" you're reading about; think you have http://dermnetnz.org/immune/cutaneous-lupus.html "cutaneous" not "systemic" which I think is what you've been looking under. Don't borrow trouble, systemic lupus is very different from the "skin" version.