A 28-year-old patient developed a painful 0.5 ´ 0.5 cm oval ulcer in her lower anterior vestibular mucosa. She has had episodes (7 to 10 days' duration) of similar painful ulcers before. This patient most likely has:

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The patient's clinical presentation is consistent with recurrent aphthous stomatitis (RAS), also known as recurrent aphthae. RAS is a common condition characterized by painful ulcers that can occur in the oral mucosa, including the vestibule area. The ulcers typically heal within 7-14 days, and recurrent episodes can occur sporadically or at regular intervals. Herpangina and recurrent herpes also present with oral ulcerations, but the former is more commonly seen in children and is characterized by fever and sore throat, and the latter is often associated with vesicular lesions and systemic symptoms. Secondary syphilis can produce mucosal ulcers, but oral lesions are not a primary feature of the disease.

A 28-Year-Old Patient Developed a Painful 0