Puffiness in the left eye is usually caused by bad habits, blepharitis, kidney failure or eye allergies. Blepharitis is a common infectious disease in ophthalmology. Under the stimulation of inflammation, patients may have red and swollen eyelids, accompanied by pain, increased secretion and other uncomfortable symptoms. Kidney failure patients because of renal dysfunction, resulting in water and salt metabolism disorders in the body, a large number of body fluids stagnant in the tissue space, can not be discharged out of the body, resulting in edema, because the eyelid part of the subcutaneous tissue is loose, usually the first part of the edema. Allergic patients because of the bags under the eyes area of the skin in contact with cosmetics, skin care products, pollen, smoke, dust and other allergens, triggering an allergic reaction caused by the patient eyelid edema, the patient can also be accompanied by local itching and other discomforts. In addition, prolonged late night, drinking a lot of water before going to bed can also lead to eyelid swelling, which can be relieved after resting. It is recommended that patients with significant eyelid swelling should consult a doctor in time to assess their condition and take treatment under the guidance of the doctor.