Single eye swelling is most commonly considered pinhole, is the acute inflammation of the blepharoplasty ducts, there will usually be local redness, swelling, pain, and localized nodules on pressure, you can consider symptomatic treatment. Anti-inflammatory can use antibiotic eye drops, such as ofloxacin, oral Chinese patent medicine to clear heat and fire detoxification. At the same time, we should also avoid eating spicy, stimulating diet or greasy hair products. Another condition is chalazion, there will also be nodules when pressed, but there is no obvious pain. It depends on the specific time of onset, if to a certain extent, you can consider surgical treatment. Another situation starts with an inflammatory pseudotumor or cyst, which usually forms a cyst-like edematous degeneration within the conjunctival sac or around the rectus muscle, which needs to be examined by ultrasound or CT to see if there is any cyst formation, and surgical treatment can be considered. Contact causes, such as makeup, pollen irritation, contact with pets to form a transient enlargement, usually accompanied by itching symptoms.