Itching, redness and swelling around the eyes of patients may be related to allergic blepharodermatitis, mosquito bites, allergic conjunctivitis and so on. 1. Allergic blepharodermatitis: if allergic patients apply allergic cosmetics around the eyes or come into contact with other allergic causes, causing local skin allergic reactions, patients may experience itchy, red and swollen eyes and other uncomfortable symptoms. 2. Mosquito bites: mosquitoes bite the patient’s eyelid local skin, because the mosquito mouthparts contain certain toxins, injected into the skin, can cause itching around the patient’s eyes, redness and swelling and other uncomfortable symptoms. 3. Allergic conjunctivitis: allergic patients exposed to pollen, dust and other allergens, can lead to allergic reactions, such as allergic conjunctivitis, patients can appear itching, redness and swelling around the eyes and other discomfort symptoms. It is recommended that patients with itching, redness and swelling around the eyes should consult a doctor in time to assess their condition and follow the doctor’s instructions for treatment.