Hello, the main cause of lower eyelid depression is excessive fat removal from orbital diaphragm during pouch surgery. In addition, the scar fusion of orbital septum and lower eyelid contraction muscle makes the orbital fat move downward and backward, which will also lead to the formation of lower eyelid depression. In mild cases, the technique of bowline loosening and shallow cheek lifting can often achieve satisfactory correction results, while in severe cases, fat fascia flap transplantation is often needed for correction.