The goal of this clinical trial is to learn if oral mini pulse (OMP) dexamethasone works to treat active vitiligo in children and also learn about the safety of this drug within this age group the main questions it aims to answer are does OMP halt activity in active vitiligo and what medical problems patients might experience while using the drug with special attention to linear growth. Researchers will give OMP dexamethasone to participating patients to see if the drug works to treat active vitiligo and whether it has any effect on linear growth. Participants will take OMP dexamethasone two fixed days per week for a period of 3 months. before starting treatment, patients will do baseline evaluation and investigations then monthly evaluation to monitor progress, report any side effects at the end of treatment period response to drug, lab values and growth will be evaluated then final evaluation of growth will be done after stoppage of drug.