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A, Healthy control. B, Stage 1 OSF: Blanched palatal mucosa with vesicle. C, Stage 2 OSF: Blanched buccal mucosa. D, Stage 3 OSF: Hockey stick uvula. E, Stage 4 OSF: Blanched labial mucosa with vesicle. F, OSCC: Carcinoma of the left labial mucosa.
