Which physical 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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Because gram-negative folliculitis usually occurs in patients with existing acne, the development of this new process is often mistaken as an exacerbation of acne.

The morphology of the lesions is as follows:

  • Type 1 (approximately 80% of patients) - Superficial pustular lesions without comedones

  • Type 2 (approximately 20% of patients) - Deep, nodular, and cystic lesions

The distribution of the lesions is extending from the infranasal area to the chin and the cheeks.

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