Surgery was performed after fracture of tibia and fibula of leg, and some muscles were necrotic after operation, so skin flap was transplanted. Is it necessary to transplant skin from the donor site of skin flap? In this case, if it is a fracture with muscle and skin necrosis, skin grafting should promote healing and recovery. If a full-thickness flap is taken, the full-thickness skin and subcutaneous tissue of the donor site are already defective and should be replanted. If the full-thickness skin defect does not need skin grafting, it can gradually heal and recover itself, mainly depending on whether the skin grafting site survives.