A swollen bag under the corner of the patient’s eye may be caused by diseases such as blepharocyst, blepharitis or dacryocystitis. 1. Blepharophalangeal cyst: due to blepharitis, chronic conjunctivitis and other causes of blepharophalangeal gland outlet obstruction, blepharophalangeal gland secretion accumulation in the eyelid, irritation of the surrounding tissues, the patient’s eyelid can form a round lump, the eyelid conjunctiva may be confined congestion. 2. Blepharitis: Blepharitis refers to purulent inflammation of the eyelid glands caused by infection with staphylococcus and other germs. Under the stimulation of inflammation, the patient’s blepharoplasts are limited to swelling and hard nodules with tenderness on palpation, as well as discomfort symptoms such as photophobia, tearing, and increase in ocular secretions. 3. Dacryocystitis: Acute dacryocystitis develops on the basis of chronic dacryocystitis, which is often secondary to stenosis or obstruction of the nasolacrimal duct, leading to accumulation of tears in the lacrimal sac, when there is infection by Staphylococcus aureus and other pathogens, it can cause conjunctival congestion, tearing, and discomfort of the skin of the lacrimal sac area with congestion, swelling, and pressure pain. It is recommended that patients with swollen bags in the corners of the eyes seek medical attention to assess their condition and follow the doctor’s instructions for treatment.