Long Term Observational Study to Collect in a Real-world populatIon Data on the Treatment Pattern of secukinumAb in Adult Patients With Moderate to Severe Hidradenitis Suppurativa.

Inclusion Criteria:

Patients eligible for inclusion in this study have to fulfill all of the following criteria at enrollment:

1. Patients who provide written informed consent to participate in the study

2. Male and female patients with ≥18 years of age

3. Diagnosis of clinically unequivocal moderate to severe HS

4. Patients for whom a therapy with secukinumab is medically indicated

5. Documented decision for treatment with marketed secukinumab regardless of thisnoninterventional study

6. Treatment with secukinumab according to the latest version of SmPC

7. Initial treatment with marketed secukinumab planned for up to 1 week before thebaseline visit

Exclusion Criteria:

Patients fulfilling any of the following criteria at enrollment are not eligible for inclusion in this study. No additional exclusions may be applied by the investigator, in order to ensure that the study population will be representative of all eligible patients:

1. Patients who have any contraindications, such as a history of or active inflammatorybowel disease (Crohn´s disease, ulcerative colitis), and are not eligible fortreatment with secukinumab according to the SmPC

2. Any medical or psychological condition in the treating physician's opinion which mayprevent the patient from the study participation

3. Simultaneous participation in any investigational trial or simultaneousparticipation in another Novartis-sponsored non-interventional study withsecukinumab

4. Previous exposure to IL-17 inhibitors

5. For biologic-naïve patients, previous exposure to another biologic drug, such asanti-TNF-α inhibitors