[(BO-uns disease) 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 (cancerous). Also called precancerous dermatosis or precancerous dermatitis. ( NCI )]
UMLS (NCI) C0006079 Relation/PAR: Carcinoma, Squamous Cell