Pseudomonas Folliculitis Workup

Updated: Oct 02, 2020
  • Author: Charles B Toner, MD; Chief Editor: Dirk M Elston, MD  more...
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Laboratory Studies

The diagnosis of Pseudomonas folliculitis is best verified by results of bacterial culture growth from either a fresh pustule or a sample of contaminated water. Gram stain of a Pseudomonas folliculitis pustule may also be performed.


Histologic Findings

Standard hematoxylin and eosin preparation displays a severe follicular epithelial inflammatory response, which may result in follicular distention and rupture. The pilar canal is filled with a dense polymorphonuclear leukocytic infiltrate, often accompanied by a brisk perifollicular lymphocytic infiltration. Both the epidermis and the infected apocrine glands remain intact.