Infection, especially bacteria and virus infection is the most commonly reason for pink eye. Take easy that pink eye is so common that your son can be fine in 4-7 days without any medical treatment. But you also need to take some measures to control it. First of all, do not let your son stay in the open air, or further eye infection may happen. Second, apply warm washcloth to clean the corner of eyes. Third, drink some eye bright tea, which is an herb, belongs to the Figwort family, contains abundant nutritional and herbal ingredients. Blepharitis, conjunctivitis, cataracts, stye, weeping eye, and bloodshot or strained eyes all can benefit from it.