Baby upper eyelid redness and swelling common causes: first, allergic conjunctivitis, common in spring and autumn, for both eyes at the same time, in addition to eyelid redness and swelling, accompanied by itching, tearing and other phenomena, by oral anti-allergy drugs can be improved. Second, mosquito bites, mostly unilateral eye disease, accompanied by itching, careful observation, in the eyelids can find traces of mosquito bites. Third, wheals or chalazion, touch the eyelid with your hand can feel a green bean or soybean size bumps, you can locally apply erythromycin eye ointment, if necessary, you can give local excision.