Swelling, itchiness and swollen eyes on the face are mostly caused by allergies, which are very common in clinical practice and are often unconscious even to themselves at times. The causes of allergy are broadly divided into the following categories: 1. Food allergy, mainly allergic food will appear allergic phenomenon. Some people are allergic to certain seasonings inside the spicy hotpot, and allergies will occur when consuming spicy hotpot and hot pot. Some people are allergic to peaches and other fruits, and when consumed, allergies can occur. 2, insect stings cause allergies, mainly after being stung by bees can cause serious allergies, often manifesting as facial redness, itching and eye swelling and pain. This situation should be treated in time, otherwise it will cause breathing difficulties and endanger the life of the patient. 3, allergies after taking drugs, which are also very common in many drugs, such as sulfa drugs, amoxicillin and other drugs can make some people appear allergic phenomenon, there will be a general rash and accompanied by facial swelling, itchy situation.