Redness and swelling of the corner of the eye may be caused by external injury, blepharitis, blepharitis and other factors. 1. external injury: if the corner of the eye accidentally hit a hard object, it may damage the tissues of the corner of the eye, resulting in local capillaries dilation or even rupture, thus appearing red and swollen corner of the eye symptoms. 2. Blepharitis: mainly caused by bacterial infection, the local inflammatory stimulation may cause congestion in the corner of the eye, resulting in redness, swelling and pain around the corner of the eye. 3. Blepharitis: Inflammation of the eyelid margins, eyelash roots and other parts of the eyelid caused by bacterial infection, patients may experience symptoms such as eyelid margin skin congestion, swelling and pain. It is recommended that patients with redness and swelling at the corners of the eyes should consult a doctor in time and choose the appropriate treatment measures under the guidance and advice of a professional doctor.