Perifolliculitis Capitis Abscedens et Suffodiens Differential Diagnoses

Updated: Apr 12, 2016
  • 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 [20]
  • 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. [21]

Differential Diagnoses