The eyelids are divided into five layers: skin, subcutaneous loose connective tissue, muscle layer, fibrous layer, and conjunctiva, in that order. Because the eyelid is the thinnest skin tissue in the body, it is easy to form folds, and the subcutaneous tissue is made up of loose connective tissue, which can easily become edematous. Therefore, when the eye is swollen because of trauma or inflammation, crying, or a systemic disease such as kidney disease, it can easily cause eyelid swelling, which can appear as edema or hematoma. First of all, it is important to maintain a good mood, stop crying, and the eyelid can be treated with a local cold compress. If the symptoms are obvious, you can consider treating it with hormonal eye drops or eye ointment, which also helps to reduce the swelling.