What are the physical findings characteristic of gram-negative folliculitis?

Updated: Oct 08, 2020
  • Author: Elizabeth K Satter, MD, MPH; Chief Editor: Dirk M Elston, MD  more...
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Gram-negative folliculitis primarily occurs in patients on long-term antibiotic therapy, most often in patients treated for acne. This type of folliculitis arises from disequilibrium of the normal skin bacteria in favor of gram-negative organisms such as Enterobacter, Klebsiella, Escherichia, Serratia,Morganella, [15] and Proteus species. These lesions manifest as multiple small pustules that are most pronounced in the perinasal region and can spread to the chin and cheeks. Approximately 4% of acne patients treated with systemic antibiotics develop gram-negative folliculitis. [31, 34]

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