The patient’s left eye is swollen and reddened, which may be caused by blepharitis, blepharitis, orbital cellulitis and other factors. 1. Blepharitis: Blepharitis is an acute inflammation caused by purulent bacteria invading the eyelid glands, most of the germs are staphylococci, especially Staphylococcus aureus, and the patient’s eyelids can be localized with redness, swelling, heat, pain and other typical manifestations of acute inflammation. 2. Blepharitis: Blepharitis is a subacute or chronic inflammation of the surface of the eyelid margin and eyelash follicles, which can also lead to redness at the corners of the eyes, accompanied by eye pain and other discomforts. 3. Orbital cellulitis: Orbital cellulitis is an acute inflammation of the soft tissues of the orbit, the onset of acute, ocular manifestations can appear eye swelling, congestion, eye can also have severe pain, so the patient can appear in the corners of the eyes of the redness, swelling and pain and other discomfort. It is recommended that patients with redness and swelling of the corners of the eyes should consult a doctor in time to assess their condition and follow the doctor’s instructions for treatment.