Injury to the nerves, usually the branches of the facial nerve or the trigeminal nerve that innervate the movement of the orbicularis oculi muscle, may result in impaired sensation of the skin under the eyes and failure of the eyelids to close completely. The nerves at the incision site may be injured during the procedure, mainly the facial nerve and the trigeminal nerve. The branch of the facial nerve is responsible for the movement of the orbicularis oculi muscle, and once injured, the contraction of the orbicularis oculi muscle will be affected, resulting in the patient’s eyelids not being able to close completely. The branches of the trigeminal nerve are mainly responsible for the sensation of the skin of the eye, and the injury will lead to localized sensory loss. If the nerve is injured after an external eye bag surgery, you need to seek medical attention and rehabilitation as soon as possible.