The principal oral and oropharyngeal lesions which may be precursor lesions are white patches (leukoplakia) and red patches (erythroplasia/erythroplakia) or mixed red and white lesions. The majority of leukoplakias will not show dysplasia and correspond to the hyperplasia category. Red and mixed lesions (speckled leukoplakia) show a higher frequency of dysplasia, often of higher grade. The majority of leukoplakias will not undergo malignant change and may even regress particularly if apparent aetiologic factors are removed.
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