I've had the lamictal rash badly and I agree with Capriousness. It is fast. When I had it I went to work with it on about oh 15% of my face. My hair hid it. By the time I left 4 hours later it was at 50% and by night 100% of my face and some of my neck. It also is very itchy and it burns like a severe sunburn, especially when wet (and I've hard others describe this so I think it's pretty consistent). I think you'd notice it. For me it started with a small patch that was really itchy on my cheek and then got much, much worse after I stupidly took another dose of it that night, not considering the rash could be lamictal.

You can get it after the risk period (I was 2 weeks past the high risk time when I got it) but it is very uncommon, esp. after months have passed. If you stopped lamictal and re-started it the rash risk goes back up.

I believe it is typically on the face as well although I could be totally wrong about that. I do know it is distinct in appearance (not to us but to drs) as I went in and said "I'm supposed to be here for bronchitis but I think..." and the dr jumped in and said "that the Lamictal rash is a bigger issue? Um, yeah..." and then he went and called my pdoc and they devised a plan.

Still, if in doubt get it checked. You don't want lamictal rash to do any growing.