What is an itchy swelling on the upper eyelid?

Eyelid contact dermatitis The most common cause of eyelid itching is eyelid contact dermatitis. It refers to allergic inflammation that occurs after the skin of the eyelid comes into contact with some substances from the outside world. The main substances causing this disease are some chemicals, such as cosmetics, etc., as well as chemical raw materials, dyes, and drugs. Before the onset, there is generally a history of exposure to chemicals. You can feel intense itching and burning sensation on the skin near the eyelids and eyelids. And more acute onset, eyelid edema, and sometimes see red papules. Treatment is mainly the application of local anti-allergic drugs, such as calamine lotion and so on.