IHS4 (Hidradenitis Suppurativa Severity)
IHS4 (Zouboulis 2017) = nodules x 1 + abscesses x 2 + draining tunnels x 4; 0-3 mild, 4-10 moderate, >= 11 severe.
Open the calculator → Runs in your browser. Data leaves only if you deliberately send a problem report from the interactive tool.
Example
- Inflammatory nodules
- 3
- Abscesses
- 2
- Draining tunnels
- 1
Result: IHS4 11 — severe (>= 11).
The tool opens with these values already filled in. Replace them with your own.
What the result means
- 0-3
- Mild.
- 4-10
- Moderate.
- >= 11
- Severe hidradenitis suppurativa (nodules x 1 + abscesses x 2 + tunnels x 4). A dynamic severity score, not a diagnosis.
What you enter
- Inflammatory nodules (count)
- Abscesses (count)
- Draining tunnels (count)
How this is calculated
Zouboulis CC, Tzellos T, Kyrgidis A, et al. Development and validation of the International Hidradenitis Suppurativa Severity Score System (IHS4). Br J Dermatol. 2017;177(5):1401-1409. Read the source ↗
A reference and educational tool. Not medical, legal, or financial advice, and not a substitute for clinician judgment.