Blocked Tear Duct (Dacryostenosis) A blocked tear duct can occur in one or both eyes. The blockage may be present at all times, or it may come and go. Conjunctivitis (Newborn/Childhood) Conjunctivitis, or pink eye, is a very common problem in children. Large outbreaks of conjunctivitis are often seen in day-care settings and schools. Keratitis Keratitis is an inflammation or infection of the cornea of the eye. It is a medical emergency because it can lead to blindness if not treated. Stye (Hordeolum) A stye is caused by an infection in the oil-producing or sweat glands in the eyelid. The infection is usually caused by bacteria called Staphylococcus aureus. Otitis Media (Middle Ear Infection) Otitis media is inflammation in the middle ear. Otitis media can occur as a result of a cold, sore throat, or respiratory infection. Otitis Externa (Swimmer's Ear) Swimmer's ear is caused by fungi or bacteria that are encouraged to grow because of water that remains trapped in the ear canal after swimming.