A 28-year-old woman developed a painful 0.5 ´ 0.5 cm oval ulcer in her lower anterior vestibular mucosa. She has had similar lesions before that have typically appeared at the time of her menstrual period. The lesions generally last a week to 10 days. She most likely has which of the following?

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The patient's history of recurrent lesions that typically appear at the time of her menstrual period and last a week to 10 days is consistent with recurrent aphthous ulcers, also known as canker sores. Pemphigoid is a blistering autoimmune disease that typically affects older adults. Recurrent (secondary) herpes would present with clusters of fluid-filled blisters. Lichen planus would present with white, lacy patches or red, shiny bumps on the mucous membranes. Erythema multiforme would present with target-like lesions on the skin and mucous membranes.

A 28-Year-Old Woman Developed a Painful 0