Well, so sorry to hear that news. But trust me, it is curable if the right treatment is given to your son. What I recommend for him is to take more good rest, drink more water , and get antibiotic medications regularly. Also, try to let him make clean use of his eyes and keep everything disinfected and avoid making close contact with others. Within a week or so, he is gonna be fine , take it easy.
Your son should be stayed at home to treat the pink eyes. He could use the eye drops with anti-inflammation to make the eyes get comfortable and get moisture. The eye drops with anti-inflammation could help him get rid of the invisible bacterium in the eyes. He could also use the warm compress to make the eyes get comfortable.
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.