I cannot find a clear set of "warning" symptoms that separate benign rashes from the one(s) that may be associated with Steven-Johnsons or other serious adverse reactions to Lamictal.

If a rash and a fever are present together, that would require an immediate trip to the emergency room. The FDA also considers swollen lymph nodes as one of the big danger signs. However, there is no single pattern of symptoms, no clear symptom cluster, that differentiates the presence of the bad rash.

The combination of depakote and lamotrigine seems most likely to produce rashes, in general. So, it's not really too surprising to discover that you got one, fayeroe. And, despite your pdoc coming in on her off-day to assess you (what a wonderful doctor), I would retain some caution. If the rash begins to itch, and you get a fever, go to the emergency room and get another opinion. It's not an emergency in the sense that you need to act instantly, as there is actually quite a large window of time within which to reverse all symptoms of the bad rash, but the bad rash occurs inside your body as well as on the surface.

I could not find one single decent resource to link to, so I kind of cobbled my answer together. Here's a link to the FDA warning. It contains a good part of what I said here.

http://www.fda.gov/medwatch/safety/1997/lamict.htm

Best,
Lar