Which histologic findings are characteristic of gram-negative folliculitis?

Updated: Aug 07, 2019
  • Author: Mordechai M Tarlow, MD; Chief Editor: William D James, MD  more...
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In contrast to typical acne lesions, lesions of gram-negative folliculitis do not contain a comedonal core. A minimal amount of keratinous material is present in an intrafollicular sea of pus. Occasionally, segments of the follicular wall may be dissolved. Organisms are located in nests around clumps of keratinous material, around hairs, and in phagocytes. In contrast to the predominant gram-negative rod recovered on culture, Gram stain of the tissue section may show a mixed flora (ie, gram-positive rods and cocci, gram-negative rods, budding yeasts).

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