![](https://webarchive.library.unt.edu/web/20090514040900im_/http://www.cancer.gov/images/spacer.gif) |
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(pree-KAN-seh-rus DER-muh-TOH-sis)
![](https://webarchive.library.unt.edu/web/20090514040900im_/http://www.cancer.gov/images/spacer.gif)
| 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. |
Previous Definitions: | Pravachol, pravastatin, pravastatin sodium, precancerous, precancerous dermatitis | Next Definitions: | precancerous polyps, preclinical study, precursor B-lymphoblastic leukemia, precursor lymphoblastic lymphoma, precursor T-lymphoblastic leukemia |
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![](https://webarchive.library.unt.edu/web/20090514040900im_/http://www.cancer.gov/images/spacer.gif) |