Definition: An inflamed acne lesion presenting as a hard, painful lump under the skin. Nodules occur when there is a deep break in the follicle wall and contaminated debris empties into the dermis, infecting adjoining follicles.
Nodules
By Angela Palmer, About.com Guide
Updated January 29, 2013
About.com Health's Disease and Condition content is reviewed by the Medical Review Board
Nodular Acne
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