Eyelids and lips suddenly swollen consider contact dermatitis, insect bite reaction, nephritis and other diseases caused. 1. Contact dermatitis: contact dermatitis is an inflammatory skin disease caused by skin contact with external substances, the patient will appear localized erythema, swelling, pimples and other symptoms, the cause of the disease including animal, plant and chemical. If the face suffers from contact dermatitis, it will lead to a sudden swelling of the eyelids and lips. 2. insect bite reaction: insect bite reaction is an allergic reaction to insect bites, manifested as redness, swelling, erythema, blisters and other changes in the skin at the bite, if the eyelids and lips suddenly swollen, need to consider mosquito bites. 3. Nephritis: Nephritis is characterized by hematuria, proteinuria, hypertension and renal impairment, etc. The causes include autoimmune disorders and heredity. Nephritis can lead to generalized edema, resulting in the phenomenon of eyelids and lips suddenly swollen. There are many reasons for the sudden swelling of the eyelids and lips, and it is recommended that the patient seek medical examination to clarify the cause of the disease.