A bulging bag under the eye is normal if it is caused by too much body fat, but not normal if it is caused by chalazion, contact dermatitis, and so on. 1. Excessive body fat: Excessive body fat may cause accumulation of fat in the lower eyelids, manifesting as bulging bags under the eyes. It may also be accompanied by sagging and bloating of the lower eyelid skin, which is a normal physiological phenomenon. 2. Chalazion: Chalazion is an idiopathic chronic non-purulent inflammation of the lid gland. It is due to the blepharoplasty gland secretion outlet obstruction caused by the accumulation of secretions formed cysts, for the eyelids at the tough lumps, generally asymptomatic and thus manifested in the lower eye bags on the bulging bag, which is not normal, need treatment. 3. Contact dermatitis: contact dermatitis is mildly manifested as erythema, mild edema, or blisters, thus appearing in the lower eye bags on the symptoms of the bulging bag, belonging to the abnormal phenomenon. Most of the skin contact with exogenous substances, stimulate the skin or trigger an allergic reaction caused by the inflammatory reaction of the skin. If the patient appeared on the lower eye bags have bulging bag phenomenon, it is recommended to go to the hospital in a timely manner, to clarify the cause of the disease.