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TB stain on a suspicious lesion at the right lateral border of the tongue. (a) An erythroplakia lesion on right lateral border of the tongue of a 52-year-old female. (b) Same lesion after application of the TB stain. TB was retained in some areas and not others. A biopsy was taken from the dark stained blue area which showed a well differentiated squamous cell carcinoma lesion. TB, toluidine blue.
