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precancerous dermatosis (pree-KAN-seh-rus DER-muh-TOH-sis)

 A skin disease marked by scaly or thickened patches on the skin and often caused by prolonged exposure to arsenic. The patches often occur on sun-exposed areas of the skin and in older white men. These patches may become malignant (cancer). Also called Bowen disease and precancerous dermatitis.



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