A bag inside the eye that appears swollen can be caused by a variety of reasons, such as blepharitis, blepharocysts, lid pits, pterygium, etc. Care should be taken not to scratch or rub as this may aggravate the symptoms. It is recommended that patients go to the hospital in a timely manner to have relevant tests performed to clarify the cause and actively take appropriate treatment measures to avoid aggravation of symptoms.1. Blepharitis: i.e., wheals, is related to bacterial infection and the main symptoms are acute inflammation such as redness, swelling, and pain in the affected area, which can result in the patient having a long and swollen bag inside the eye and possibly pustules and tearing. Patients can promote blood circulation in the eye by applying local heat to relieve the symptoms. If pustules appear, antibiotic eye drops, such as norfloxacin eye drops and levofloxacin eye drops, can be applied under the guidance of a professional doctor, and erythromycin ointment can be applied externally. The main symptom is a round lump under the skin of the eyelid, which can lead to a long and swollen bag inside the eye. If the lump is small, there is usually no need for special treatment, as it can be gradually relieved by local heat application and physical therapy massage. If the lump is large, it will need to be surgically removed. In addition, if there is an infection, the inflammation will need to be treated in the same way as blepharitis; 3. Blepharospasm: If a patient has blepharospasm, it can be characterized by a swelling of the eye, usually accompanied by dry eyes and a foreign body sensation. Usually no treatment is needed, but if inflammation exists, non-steroidal anti-inflammatory drugs and glucocorticoids, such as dexamethasone drops and flurbiprofen drops, can be applied under the guidance of a medical professional. It helps to relieve the symptoms. If the inflammation recurs or affects normal life, surgery may be considered. 4. Pterygium: If a patient has a pterygium, it may appear as a swollen bag inside the eye and is usually accompanied by discomfort such as redness, dryness, congestion, hypertrophy, and foreign body sensation, which can lead to vision loss in severe cases. If the pterygium is small, antibiotic eye drops can be used to help relieve the congestion and control the inflammation, and if the congestion is severe, corticosteroid eye drops can be added on top of this to help relieve the symptoms. If the pterygium is large and close to the pupil, or if the patient has symptoms such as limited eye rotation, surgery is required to remove it.