Swollen corners of the eye can be caused by many factors and the causes of swelling in the inner and outer corners of the eye vary, but most of the time it is due to some inflammatory reaction. Swelling in the inner corner of the eye is commonly caused by lacrimal sacitis, inflammation of the lacrimal ducts, and hypertrophy of the lacrimal caruncle due to some conjunctival inflammation. Swelling of the outer corner of the eye can be due to lacrimal gland inflammation, tear duct prolapse, etc. In addition, canthal blepharitis, blepharitis, and cellulitis can also cause redness and swelling in the corners of the eyes, both in the inner and outer corners of the eyes, depending on their location, and can be painful. The skin around the eyes is thin and tender, and the subcutaneous tissue is relatively loose, so when there are signs of infection, it can easily spread due to external stimuli. Therefore, when dealing with redness and swelling in the corners of the eyes, it is important not to squeeze hard or rub frequently to avoid the spread of inflammation and infection, and most likely to aggravate the reaction to the disease that has already occurred. The safest thing to do is to consult a professional hospital when you find redness and swelling in the corner of the eye, accompanied by redness, swelling, heat and pain, and when there are no signs of relief or a tendency to worsen over time, in order to obtain the most timely and effective treatment and reduce the risks that may be caused.