Conjunctivitis is inflammation of the thin tissue that covers the eyeball. This may be caused by bacteria or viruses, but allergies, trauma, or foreign material can also cause the eye to become inflamed. An eye that is red but is not uncomfortable or painful can be observed at home for 1-2 days. If there is no improvement in that time or discomfort occurs, call your pediatrician. Call immediately if light sensitivity occurs or if increased eyelid swelling or redness develops. If your child wears contact lenses, be sure to remove them until symptoms are resolved.