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 B: The Secondary Lesions

Secondary lesions may evolve from primary lesions, or may be caused by external forces such as scratching, trauma, infection, or the healing process. The distinction between a primary and secondary lesion is not always clear.


Crusting is the result of the drying of plasma or exudate on the skin. Please remember that crusting is different from scaling. The two terms refer to different phenomena and are not interchangeable. One can usually be distinguished from the other by appearance alone.


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