The corner of the eye redness is generally due to external stimulation or eye disease, external stimulation including eye fatigue, foreign bodies, trauma, etc., eye diseases including allergic conjunctivitis, blepharitis, lacrimal sacitis, etc., there are several common: a. External stimulation 1, eye fatigue: such as the existence of patients stay up late for a long time or play cell phones for a long time to see the computer, resulting in eye overwork, dry eyes, corner of the eye redness and swelling of the situation The patient is recommended to pay attention to rest, but also moderate massage or hot compresses to relieve symptoms; 2, foreign bodies in the eye: is due to sand, flying insects and other foreign objects into the eye, due to foreign body friction and lead to redness and pain in the corner of the eye, the patient is recommended to use saline or water for cleaning, conducive to the removal of foreign bodies, such as the inability to remove the need to go to the ophthalmology consultation; 3, eye trauma: including mechanical injury, chemical injury, electro-optical Irritation injury, etc., the appearance of eye trauma should be promptly to seek medical attention to avoid serious consequences. Allergic conjunctivitis is an inflammation caused by allergies to pollen, dust, cosmetics, etc. It is characterized by redness of the corners of the eyes or eyelids, swollen eyes, itching, etc. Patients are advised to seek medical attention to identify allergens, avoid contact with allergens, and get anti-allergy treatment. The patient can be treated with local or systemic antibiotics. 3. Dacryocystitis: It is caused by various reasons such as narrowing or obstruction of the nasolacrimal duct, retention of tears in the lacrimal sac, and infection resulting in redness, swelling, and pain in the corner of the eye, which can be treated with antibacterial drugs, such as levofloxacin and tobramycin, which can remove the infection and relieve the symptoms. 4. Other: inflammation of the inner and outer corners of the eye, inflammation of the lacrimal duct, and wheals, etc. Eye lesions can cause redness and swelling in the corner of the eye, you need to go to the hospital for a detailed examination to clarify the cause and then carry out targeted treatment.