Drug Reaction With Eosinophilia and Systemic Symptoms Syndrome in a Patient Taking Lamotrigine: A Case Report Based Literature Review.

A 29-year-old patient presented to the hospital with worsening generalized rash for the last two days from a mental health facility. The patient was commenced on lamotrigine two weeks earlier, and he developed fever and generalized macular rash on his body. His blood tests showed deranged liver function tests (LFTs) and clotting with raised eosinophil count, and he was treated for lamotrigine-induced drug reaction with eosinophilia and systemic symptoms (DRESS) syndrome. The patient was commenced on prednisolone 50 mg once daily with a proton pump inhibitor cover, and lamotrigine was suspended on advice from Dermatology. The patient showed improvement after 3-4 days of treatment. His skin biopsy showed prominent suppurative granulomatous folliculitis, mild perivascular chronic inflammation, and red blood cell extravasation, including the rare eosinophil. He was weaned off from prednisolone by 5 mg weekly and had complete resolution of symptoms.