Redness in a circle around the eyes may be caused by excessive eye use, contact dermatitis and conjunctivitis. 1. Excessive eye use: due to prolonged viewing of cell phones, television and other electronic products, causing persistent dryness and swelling of the eyes, rubbing the eyes with the hand is prone to the phenomenon of redness in a circle around the eyes. 2. Contact dermatitis: when patients come into contact with allergens such as pollen, animal fur, or use skin care products that contain allergic substances, it will cause the skin around the eyes to appear red and itchy, and in severe cases, blisters may also appear. 3. Conjunctivitis: Inflammation of the conjunctival tissue due to various reasons, resulting in conjunctival congestion, edema, and sometimes it can spread to the surrounding tissues, causing a circle of redness around the eyeball. Patients with the above symptoms should go to the hospital in time to avoid delaying the condition and causing adverse consequences.