Hello, Lamictal has a number of uses and generally it is well tolerated by most. In about 10% of people there is a reported adverse reaction of that of a rash. Occasionally these rashes can be life-threatening but usually they are harmless but irritating to the patient. With regard to the numbness in the extremities this is also very likely caused by the Lamictal. Typically patients that I have had that had this experience described it as pin pricks in the arms and legs. I have seem numerous people over the years with both of these complaints as a result of Lamictal, so I would surmise that is your cause. Take care. Hope I have answered your question. Let me know if I can assist you further. Regards, Dr. David Girardi, Internal Medicine Specialist