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Can you make the diagnosis? This 33-year old Caucasian female presents complaining of a history of recurrent oral ulcers since childhood. In the past these ulcers typically lasted approximately 7-10 days and recurred every few months. However, more recently she has developed more persistent areas of irritation and ulceration, which tend to come and go.

Figure 1. White, interlacing, keratotic striae and associated mucosal erythema of the right mandibular vestibule and posterior buccal mucosa.