One side effect of taking lamotrigine (Lamictal) is a rash, which may turn serious. Learn how to recognize it, treat it, and when to get emergency help. Lamictal rash is a side effect of the prescription medication. This guide discusses symptoms of the rash, as well as information about treatment and diagnosis. Key Takeaways If you get a rash while taking Lamictal, you should see your doctor right away. Lamictal can cause serious reactions like Stevens-Johnson syndrome or toxic epidermal necrolysis. To avoid a serious Lamictal rash, start on a low dose and increase it slowly. Learn how to spot a mild lamotrigine rash versus a serious reaction, and know when to call your doctor right away. Identify the characteristics, timeline, and associated symptoms of a potential Lamictal-induced rash. This guide compares mild reactions with severe, life-threatening conditions like SJS and outlines the critical steps to take when a rash appears. In this article, we cover the frequency of Lamictal rash, symptoms, treatment, and possible complications. Contact your healthcare provider or other emergency medical services right away if you develop a rash or other signs of a drug allergy (such as a fever or swelling of your lymph nodes) while taking lamotrigine. Most Lamictal rashes are harmless, but some signal a serious reaction. Learn how to tell the difference and when to call your doctor. Lamotrigine can cause a rash, which may range from mild to serious. Learn how to identify symptoms, reduce risks, and when to seek medical help. Lamictal can cause a rash that may be a sign of a serious allergic reaction. The rash can appear as small, itchy, pink bumps on the skin. If you notice a rash while taking Lamictal, seek medical help immediately, even if the symptoms are mild.