Which histologic findings are characteristic of pseudofolliculitis?

Updated: Oct 08, 2020
  • Author: Elizabeth K Satter, MD, MPH; Chief Editor: Dirk M Elston, MD  more...
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In pseudofolliculitis barbae and acne keloidalis nuchae, the inflammatory infiltrate is initially perifollicular and is composed of neutrophils and lymphocytes; however, later, the predominant cells are monocytes and plasma cells. Often, free hair shafts without the accompanying follicle can be identified within the dermis. The hair shafts are typically surrounded by acute or granulomatous inflammation and fibrosis. Hypertrophic scar is often present. [35]

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