Clinical Challenge: A Painful Lesion on the Inside of the Lip

A 50-year-old woman presents with a painful lesion on the inside of her upper lip. She has had similar lesions on an intermittent basis over the past several years in this location and on her tongue and buccal mucosa. The lesions heal without scarring. Medical history is negative for systemic disease, and the patient reports no antecedent fever or arthralgia.