Yellow eye boogers in the corners of the eyes of young children may be caused by conjunctivitis, chronic dacryocystitis, nasolacrimal duct hypoplasia and so on. 1. Conjunctivitis: Conjunctivitis may be caused by bacterial, viral or allergic diseases. If a toddler suffers from conjunctivitis, under the stimulation of inflammation, the eye secretion of the child increases, so the child has yellow eye boogers in the corner of the eye, which may be accompanied by photophobia, tearing, conjunctival congestion and other uncomfortable symptoms. 2. Chronic dacryocystitis: If the congenital abnormalities of the tear ducts of young children, secondary infection will lead to chronic dacryocystitis, and the eye secretions of young children increase, and the children may have yellow eye boogers in the corners of their eyes. 3. Inadequate development of nasolacrimal duct: If the nasolacrimal duct of young children is underdeveloped, the tears can not be discharged normally, and the children may have yellow eye boogers at the corners of their eyes. It is recommended that children with yellow eye droppings at the corners of their eyes and other discomforts should consult the hospital in time to assess their condition and follow the doctor’s instructions for treatment.