This study is checking if a medicine called povorcitinib can help people with nonsegmental vitiligo, a condition that causes skin to lose its color in patches. To join, you need to be at least 18 years old and have certain levels of skin affected by vitiligo. You must stop using other treatments for vitiligo during the study and take precautions to avoid pregnancy. You can't join if you have other skin problems, abnormal thyroid levels, or have used certain treatments like laser or phototherapy recently. People with certain medical histories, like heart problems or infections, also can't join. The study aims to see if povorcitinib is safe and effective.

• Duration: The study involves multiple visits over a period of time.
• Compensation: Participants may receive compensation for their time and travel.
• Risks: Potential risks include side effects from the medication.