RecruitingDrug trialEfficacy of Upadacitinib After NECS in VitiligoThe goal of this clinical trial is to investigate the efficacy of upadacitinib after NECS in participants with vitiligo. The main question it aims to answer is: whether the short time use of upadacitinib after NECS will improve NECS efficacy. Participants in the experimental group will receive upadacitinib after NECS, while Participants in the control group will receive NECS only.