Swollen and painful eyes can be considered to be associated with insect bite dermatitis, wheals, acute conjunctivitis and other causes. 1. Insect bite dermatitis: When mosquito bites, since the eyelids are the thinner part of the skin on the whole body, it is easy to make the whole eyelid appear diffusely swollen. The eyes appear distended and painful sensation. 2. Wheat grain seed: follicle blockage secondary infection, so that pus around the eyelid, the boundary is obvious, not too diffuse. You thus appear eyelid swelling and pain manifestation. At this time, the routine local application of anti-inflammatory drops and eye ointment, generally can make the symptoms subside. 3. Acute conjunctivitis: mainly caused by bacterial or viral infection, can be under the guidance of the doctor, the application of levofloxacin eye drops, acyclovir eye drops and other treatment. When there is swelling and pain in the eyes, it is recommended to go to the ophthalmology clinic in time for examination and diagnosis of the cause of the disease. At the same time, excessive eye use should be avoided and good eye habits should be maintained.