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“Obligate precanceroses These correspond completely to Dubreuilh’s definition of precancerosis. They show no tendency to spontaneous regression and therefore should not remain untreated. Obligate precanceroses include the following: Keratoses Actinic: actinic keratoses, cheilitis precancerosa, radiation keratoses, keratoses in xeroderma pigmentosum Chemical: arsenic and tar keratoses, Cornu cutaneum, Bowen’s disease, Queyrat’s erythroplasia Paget’s disease, leukoplakia, lentigo […]