Hurley stage; Hurley staging system;

Generally recognized classification for the clinical severity of hidradenitis suppurativa.

A distinction is made between 3 degrees of severity (Hurley) depending on the clinical manifestation:

• Hurley grade I: Isolated, single or multiple painful abscesses, no scarring or fistula tracts.
• Hurley grade II: Recurrent painful abscesses with cord formation and scarring, single or multiple, but not extensive.
• Hurley grade III: Diffuse, plate-like, inflammatory, painful infiltrations, or multiple interconnected cords (fistulous tracts) and abscesses. Risk of joint contractures due to pain-related restriction of movement.

1. Nguyen TV et al. (2021) Hidradenitis suppurativa: an update on epidemiology, phenotypes, diagnosis, pathogenesis, comorbidities and quality of life. J Eur Acad Dermatol Venereol 35:50-61.