The child’s eyelid swelling into a single eyelid, may be long-term crying, mosquito bites, blepharitis, allergies and other factors, need to be based on the accompanying other symptoms, to determine. 1. Long-term crying: If the child has been crying for a long time and rubbing his eyes with his hands, the child may have swollen eyelids, but generally can gradually return to normal, without special treatment. 2. Mosquito bites: If mosquitoes happen to bite the skin around the child’s eyelids, it can also cause the eyelids to swell into a single eyelid phenomenon, and can be accompanied by itching, burning pain and other phenomena. 3. Blepharitis: blepharitis is an acute suppuration of the eyelid glands caused by staphylococcus and other infections, and the child may have red, swollen eyelids, conjunctival congestion, and other manifestations, as well as eyelid pressure and pain, which can make the child’s eyelids swollen into a monocular eyelid. 4. Allergy: when allergic children contact, eat, inhale allergens, can trigger allergic reactions, resulting in children’s skin, edematous erythema, may be accompanied by red, itchy eyes, children’s eyelids swollen into a single eyelid performance. It is recommended that patients with significant eye swelling seek prompt medical attention to assess their condition and follow medical advice.