What does the Lamictal (lamotrigine) rash look like?

My psychiatrist put me on Lamictal and told me that the only serious side effect to look out for was the rare but serious rash. Anyone who has been prescribed Lamictal has been warned about the rash. What my psychiatrist didn't tell me was exactly what the rash looked like. It is obvious or subtle? Does it appear in scattered splotches or large discolored areas? Does it appear in pumps or just discoloration or both? I want to know so that I don't panic if I get a little acne on my neck or something.