This was a prospective study where the cohort was recruited from the patients attending the outpatient pigmentary clinic of the dermatology department of Post Graduate Institute of Medical Education and Research, Chandigarh. Institute Ethics Committee approvals (Intramural) were obtained before initiation of the study and all research was performed in accordance with relevant guidelines/regulations. Thirty patients aged 12–60 years with a clinical diagnosis of unstable, non-segmental vitiligo with a body surface area of 10–50% and having both acral and non-acral lesions were included in the study. Unstable disease was defined as the occurrence of new lesion(s), progression of existing lesion(s), or Koebnerisation with a VIDA score of 4 + . Patients with segmental vitiligo and universal vitiligo, pregnant and lactating mothers, any contraindication to NBUVB therapy like xeroderma pigmentosa, systemic lupus erythematosus and other photo-induced or photo-aggravated dermatoses, patients who have received any systemic treatment in the past 4 weeks and patients with unrealistic expectations were excluded from the study. After obtaining informed consent from the included patients, baseline characteristics, history, and clinical examination findings of the patient were noted. Disease activity and extent were evaluated by Vitiligo disease activity score (VIDA) and Vitiligo Area Severity Index (VASI), respectively. Lesions distal to the elbows and knees were considered acral lesions. Lesional VASI was calculated separately for acral and non-acral lesions.