Swelling of the bridge of the nose and eye on one side of a child may be caused by external collision or allergic reaction. 1. External collision: If the orbital bridge of the nose is subjected to external collision, the skin of the orbital bridge of the nose will be damaged under the collision of the external force, and the symptoms of swelling will appear. 2. Allergic reaction: it is considered that the orbital bridge of the nose may be in contact with allergens, thus causing the phenomenon of swelling, it is recommended to go to the hospital in time for a detailed examination, to identify the allergens, to avoid the second contact, you can generally use cetirizine, loratadine and other drugs for treatment. There may be other reasons for the swelling of one side of a child’s orbital nose, it is recommended to go to the hospital for a detailed examination, and then according to the specific cause of the symptomatic treatment. All of the above medications should be used under the guidance of a doctor.