Hi sanityseeker, just saw this; I haven't been on much in a while.
Your description of the rash on the inside of your elbows is really familiar. Just the last couple of months, I'll get the same thing, roundish but it's probably 3-4 inches across. It goes away pretty quickly with steroids, but the weird thing is that it always shows up on both arms at the same time. It kind of looks like hives. I'm on 200 mg Lamictal and I asked my GP the last time I saw him, but he felt confident it was eczema since I also have an autoimmune disorder.
Then when I read Kymaro's comment about the mouth, wow..I've had problems with that for months, still thinking it's eczema, but I think I need to ask my GP more questions.