The prevalence of nonmelanocytic skin cancers has been evaluated from histologic data related to the population of the Mosan region of Belgium. 2,538 neoplasms were identified over a period of 5 years. The collected data are in opposition with those provided by the national cancer registry of Belgium. Nonmelanocytic skin cancers represent at least 15 % of the total number of cancers. The relative risk to develop a given malignant cutaneous neoplasm rather than another is constant until 80 years of age. The age distribution of the rates of estimated prevalence is different between keratoacanthomas on the one hand and basal and squamous cell carcinomas on the other hand.