The main causes of conjunctivitis in children include the following: 1. Symptoms caused by pathogenic infections in children, which often cause infectious conjunctivitis when children are infected with bacteria or viruses in the eyes, resulting in itchy eyes and conjunctival congestion, which can be relieved by applying tobramycin drops. 2. 3, due to allergic factors, if children suffer from fish, shrimp or dust mite allergies, after contact with the corresponding allergen stimulation will also cause allergic conjunctivitis.