A four-year-old child sleeping up a swollen eye may be blepharitis, mosquito bites, conjunctivitis, etc., when the discomfort symptoms are obvious, it is recommended that the patient seek medical examination and treatment. 1. blepharitis: four-year-old children sleep up an eye swelling may be staphylococcus aureus infection of the eyelid glands caused by blepharitis, the patient’s swollen place can be accompanied by pain, redness, fever, can be in the doctor’s guidance of topical erythromycin ophthalmic ointment, etc., treatment, and at the same time, refrain from rubbing the eyes. 2. Mosquito bites: in summer, four-year-old children sleep up an eye swollen and also accompanied by itching, wind, should be considered mosquito bites caused. 3. Conjunctivitis: a four-year-old child sleeps up a swollen eye can also be caused by bacterial infection caused by conjunctivitis, the patient will also have redness of the white of the eye, increased secretion and other discomforts. A four-year-old child sleeps up an eye swollen, a long time no relief or accompanied by other obvious discomfort, it is recommended to consult a doctor in time to deal with.