How are active and inactive disease distinguished in hidradenitis suppurativa (HS)?

Updated: Aug 30, 2019
  • Author: Marina Jovanovic, MD, PhD; Chief Editor: William D James, MD  more...
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Answer

The characteristic sites were chosen in accordance with the 2 areas most frequently affected by hidradenitis suppurativa: the axillae and the groin. These areas are defined by anatomical borders and are called designated sites. Hidradenitis suppurativa is diagnosed if the patient has 1 of the following:

  • Active disease with 1 or more primary lesion in a designated site, plus a history of 3 or more discharging or painful lumps (not specified) in designated sites since age 10 years

  • Inactive disease with a history of 5 or more discharging or painful lumps (unspecified) in designated sites since age 10 years, in the absence of current primary lesions [4]


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