What is the pathophysiology of eosinophilic folliculitis (EF)?

Updated: Mar 17, 2021
  • Author: Camila K Janniger, MD; Chief Editor: Michael Stuart Bronze, MD  more...
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Although the exact etiology of eosinophilic folliculitis remains obscure, studies have favored an autoimmune process directed against sebocytes or some component of sebum. Markers of acute inflammatory activation of the epithelia, such as ICAM-1 and MAC 387, are strongly positive in sebocytes of eosinophilic folliculitis lesions but only weakly reactive in the follicular epithelium. Antibody formation and the creation of immune complexes are believed to directly or indirectly mediate clinical manifestations. Patients with eosinophilic folliculitis create antibodies to the intercellular substance of the lower epidermis and the outer root sheath of the hair follicle. An abnormal Th2-type immune response to a follicular antigen, such as caused by Demodex species, may be responsible for HIV-associated eosinophilic folliculitis.

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