Diagnostic criteria for hidradenitis suppurativa were proposed at the Second International Hidradenitis Suppurativa (HS) Research Symposium in 2009.

Clinical criteria – all of the following:

(1) typical lesions (see below)

(2) typical locations involved (see below)

(3) chronic condition with recurrent episodes


Typical lesions – one or more of the following:

(1) deep-seated painful nodules (blind boils)

(2) abscesses

(3) draining sinuses

(4) bridged scars

(5) tombstone open comedones


Typical locations:

(1) axillae

(2) groin

(3) genitals

(4) perineum

(5) perianal region

(6) buttocks

(7) infra and/or inter-mammary folds

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