Primary Care Dermatology Module
Nomenclature of Skin Lesions

Developed by Gary Williams, M.D. and Murray Katcher, M.D. Ph.D, Department of Pediatrics
with funding and support from the Wisconsin Area Health Education Center (AHEC) System

University of Wisconsin

Tutorial A: The Primary Lesions

Primary lesions are physical changes in the skin considered to be caused directly by the disease process. Types of primary lesions are rarely specific to a single disease entity.


A plaque is a solid, raised, flat-topped lesion greater than 1 cm. in diameter. It is analogous to the geological formation, the plateau.

Plaque Plaque

Click on each image for further information.

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