Conjunctivitis in a 4-year-old child is usually caused by a bacterial infection, also known as pinkeye, and recovery from this disease usually takes about 2-3 weeks. The symptoms of the disease are usually edema of the eyelids, congestion of the conjunctiva, and a large amount of yellowish-white purulent discharge, usually in both eyes simultaneously or sequentially. In the early stages of the disease, the eyes need to be kept locally clean and the eye discharge removed promptly using saline. In addition, it is important to choose sensitive antibiotic eye drops to control local inflammation. The most commonly used for children is tobramycin eye drops, also known as Tobramycin eye drops. In the early days when the symptoms are heavy, the frequency of eye drops can be appropriately high, once every 1-2 hours, and then gradually lower the frequency as the symptoms decrease until the disease is completely back to normal. This disease is contagious, so during the treatment and recovery period must do a good job of isolation to avoid contact infection.