Table 1.

Classification systems for hidradenitis suppurativa

Scoring system	Description
Hurley staging	Hurley stage I = single or multiple nodules and/or abscesses without permanent lesions or scarring; Hurley stage II = widely separated recurrent nodules and/or abscesses with sinus tracts and scarring; Hurley stage III = multiple interconnected sinus tracts, abscesses, and scarring affecting an entire anatomical area
IHS47	International Hidradenitis Suppurativa Severity Score System: (Number of nodules × 1) + (number of abscesses × 2) + (number of draining tunnels × 4) ≤3 = mild 4–10 = moderate ≥11 = severe
Sartorius score 6	Three points per anatomic region involved: axilla, groin, gluteal (left/right), or other region. Count total number of different lesions: Nodule = 2 points Fistula = 4 points Scar = 1 point “Other” = 1 point. The longest distance between two relevant lesions (or if a single lesion, size of lesion) in each region: <5 cm = 2 points 5–10 cm = 4 points >10 cm = 8 points. Are all lesions separated by normal skin? Yes = 0 points No = 6 points
HiSCR 7	Hidradenitis Suppurativa Clinical Response: Defined as at least a 50% reduction in the total inflammatory nodule count (abscesses + inflammatory nodules) and no increase in abscess count or draining fistula count relative to baseline. (This is an outcome measure and a meaningful clinical endpoint for treatment. It is not a true classification system.)