Add to ORKGOral lichen planus is a common condition with an unclear etiology although some common drugs have been implicated. We report on a 75-year-old Chinese woman with painful erosions and ulceration of the lateral tongue, gingivae, and buccal mucosa who had been taking methyldopa for several years and allopurinol for more than a month. Following the classic bilateral presentation, a provisional clinical diagnosis of oral erosive lichenoid planus was made and drug therapy changed to metoprolol and paracetamol. Topical steroids, analgesic, and antiseptic mouth rinse were prescribed. After 6 weeks, all lesions had resolved although a few Wickham’s striae remained. The patient’s oral function was restored and to date the lesions are in remission. It...