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A Case for Diagnosis (Vincent's Infection?). Presented by Edward A. Oliver.
A white woman, aged 42, presents on the buccal mucosa of the lower lip two oval-shaped infiltrated ulcers. She states that about five weeks ago the lesions began on the left side of the lower lip as a "canker" sore. She bit this, and the ulceration began to increase in size and extent. The lip is swollen, painful and tender to the touch. There are no palpable glands in the submaxillary or submental region. The dark field examination did not reveal spirochetes. The Wassermann and Kahn reactions were negative, and a smear was negative for Vincent's organisms.
Dr. H. E. Michelson, Minneapolis: I do not know just how to classify these ulcers. I have seen similar ones, and I have vacillated between Vincent's angina and erythema multiforme. I believe that there is a form of necrotic aphthous
Lester M. Wieder, Marcus R. Caro. CHICAGO DERMATOLOGICAL SOCIETY. Arch Derm Syphilol. 1946;54(2):224–239. doi:10.1001/archderm.1946.01510370108016