Pharmacokinetics, Safety, and Efficacy of Povorcitinib in Adolescent Participants With Moderate to Severe Hidradenitis Suppurativa

Inclusion Criteria:

* Aged ≥ 12 to \< 18 years at the time of informed consent/assent signing.
* Body weight ≥ 30 kg at both screening and baseline visits.
* Diagnosis of moderate to severe HS for at least 3 months prior to the screening visit.
* Total abscess and inflammatory nodule count of at least 5 at both the screening and baseline visits.
* HS lesions corresponding to refined Hurley Stage IB, IC, IIB, IIC, or III at both the screening and baseline visits.
* Documented history of inadequate response to at least a 3-month course of at least 1 conventional systemic therapy (oral antibiotic or biologic drug) for HS (or demonstrated intolerance to, or have a contraindication to, a conventional systemic therapy for treatment of their HS).
* Agreement to use contraception.
* Willing and able to comply with the study protocol and procedures.
* Further inclusion criteria apply.

Exclusion Criteria:

* Presence of \> 20 draining tunnels (fistulas) at either the screening or baseline visit.
* Women who are pregnant (or who are considering pregnancy) or breastfeeding.
* Medical history including thrombocytopenia, coagulopathy or platelet dysfunction, Q-wave interval abnormalities, current or history of certain infections, cancer, lymphoproliferative disorders and other medical conditions at the discretion of the investigator.
* Laboratory values outside of the protocol-defined ranges.
* Further exclusion criteria apply.