Abstract: Objective: To assess the application of dilator in repairing congenital nevus on extremities in children. Methods: In the first stage, 1 to 3 cylindrical expanders with 10 to 300 mL were placed at left or right sides or at upper or lower parts of the nevus. In the second stage, nevus were repaired with expanded transverse propulsive and lateral or rotary flaps, according to the areas and shapes of the scars. The survival rate of the flap was assessed. Results: Thirty cases of congenital nevus on the extremities were treated with expanded skin flaps and 34 skin expanders were implanted. Of 34 skin expanders, 27 were successfully expanded, 3 exposured and 4 were infected. Of 27 flap successfully expanded, 26 survived with satisfactory function, and 1 flap has local necrosis on the edge. Conclusion: The application of dilator in congenital nevus is safe and effective. 

Key words: skin tissue expansion, congenital nevus