A large swollen bag on the eyelid can generally be seen in two conditions: the first, the manifestation of mydriasis, which is an acute inflammation due to bacterial infection of the lid glands, so in the early stages there will be redness and swelling of the eyelid with pain. It is recommended to give active anti-infection treatment, you can choose antibiotic eye drops or eye ointment to control inflammation, such as levofloxacin hydrochloride eye drops or erythromycin eye ointment. If symptoms are very pronounced, systemic oral antibiotics may also be given. The second, seen in contact blepharitis, is usually due to a local allergic reaction, which is usually characterized by the appearance of a lump or large pack within a short period of time, but without painful symptoms. Local cold compresses can be applied and anti-allergy medications such as oral loratadine or topical glucocorticoid drops can be used to promote remission.