This is a non-interventional, prospective, multinational, post-marketing, observational study designed to describe the real-world effectiveness, safety, and patterns of use of dupilumab in patients with PN. This study will be conducted globally and will collect data available from patients' medical files and other items routinely collected during disease management in clinical practice and PROs related to disease, work productivity, and QoL.

This is a randomized, double-blind, parallel group, vehicle-controlled phase to evaluate the efficacy and safety of diacerein 1% ointment applied topically once daily for 8 weeks for the treatment of adult and pediatric (age ≥ 6 months) patients with generalized EBS. The duration of study participation is anticipated to be approximately ~16 to 20 weeks per patient consisting of a Screening Period of up to 4 weeks, a Treatment Period of 8 weeks and a No Treatment Follow-up Period of 8 weeks. Patients that complete this portion of the study will be eligible to participate in an open-label, 24-week extension phase to evaluate the long-term safety of diacerein 1% ointment for the treatment of generalized EBS.

The purpose of this study is to evaluate the efficacy and safety of bimekizumab compared to active control (ustekinumab) in children and adolescents (from 6 to <18 years of age) with moderate to severe plaque PSO. This study will consist of the following periods:
• Screening Period: up to 5 weeks
• Initial Treatment Period: 16 weeks
• Maintenance Period: 32 weeks
• OLE Period: 104 weeks
• SFU Period: 20 weeks after final dose of IMP
After the Screening Period of up to 5 weeks, eligible study participants will be randomized in a 2:1 ratio of bimekizumab to ustekinumab. Study participants will participate in a 16-week double-blinded Initial Treatment Period and continue into a 32-week double-blinded Maintenance Period. After completion of the Maintenance Period, study participants will be offered the opportunity to continue in a 104-week open label extension period and receive bimekizumab.