Perifolliculitis Capitis Abscedens et Suffodiens Differential Diagnoses

Updated: May 16, 2022
  • Author: Malgorzata D Skibinska, MD, PhD; Chief Editor: Dirk M Elston, MD  more...
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Diagnostic Considerations

Conditions to consider in the differential diagnosis of perifolliculitis capitis abscedens et suffodiens (PCAS) include the following:

  • Acne keloidalis nuchae

  • Brocq pseudopelade

  • Tinea capitis [26]

  • Folliculitis decalvans

Alopecic and aseptic nodules of the scalp (AANS) is another disorder to consider in the differential diagnosis. According to a study by Abdennader et al, however, characteristics of AANS, including the occurrence of nonscarring alopecia, differentiate it from PCAS. [27]

Differential Diagnoses