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Table 1 Hurley’s Staging System[10]

From: A review of wide surgical excision of hidradenitis suppurativa

Stage Characteristics
I Solitary or multiple isolated abscess formation without scarring or sinus tracts.
II Recurrent abscesses, single or multiple widely separated lesions, with sinus tract formation. (Require minor surgery such as incision and drainage.)
III Diffuse or broad involvement across a regional area with multiple interconnected sinus tracts and abscesses