Yeah, if you start to get any skin condition; you need to talk to your doctor. It sounds like you are having some reaction and you definitely don't want to be itching. Did you titrate up on it at a slow pace? Yes , I had to just look at the day. Were you going up by 25mgs and how fast? Also what dose are you at now?

Sorry for all the questions but you do need to be careful when starting Lamictal. Also let me say often people have minor skin issues when taking it. Usually not dangerous. Like my back broke out but it comes and goes.

At any case please call your doctor as soon as you can!

I don't know if you have any information on it. The doctor should have gave you information and talked to you about it. Also the rash usually appears very fast after you start the medicine.
I'm sure your doc, will want to see you to make sure everything is okay.