The good news for you is, Lamictal can cause regular rashes. If you have a rash, it might not be THE rash (i.e., Steven-Johnson Syndrome). So, you might be safe.

Either way, I would contact someone about this rash. Don't continue to take this medication while you have a rash.

Your pdoc may pull you off it or she may try something to handle the rash... but you have to accept whatever her decision is. Trust that she will do the right thing for you.