This study aims to evaluate the effectiveness of ruxolitinib cream compared to a placebo (vehicle) cream in treating vitiligo in children aged 2 to 12 years. The vehicle cream looks identical to the ruxolitinib cream but contains no active medication. By comparing these two treatments, researchers hope to determine whether ruxolitinib is more effective than the placebo in improving facial and body vitiligo symptoms. This study could provide important insights into new treatment options for young children affected by this condition.