What are the histologic findings of acne vulgaris?

Updated: Mar 26, 2019
  • Author: Jaggi Rao, MD, FRCPC; Chief Editor: William D James, MD  more...
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The microcomedo is characterized by a dilated follicle with a plug of dense keratin. With progression of the disease, the follicular opening becomes dilated, and an open comedo results. The follicular wall thins, and it may rupture. Inflammation and bacteria may be evident, with or without follicular rupture. Follicular rupture is accompanied by dense inflammatory infiltrate throughout the dermis. Later, extensive fibrosis and scarring may develop. [34]

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