Red eyes are not that much horrible. First, you need to ask your son to get more rest. Then a warm compress will keep eyes free from any discharge, and a cold compress can also be helpful.
You need to keep your son's eyes clean all the time. Washing eyes can remove any foreign objects that may be irritating your eyes.
By the way, you can use moist artificial tears to fasten his recovery session.
Well, of course, allergies can cause red eyes. Generally speaking,, there are some allergies resources which can just lead to eye allergies. And then your eyes will turn red, itchy, and even bloodshot. And at this time, you need to pay more attention to your eyes, for it will just make some disorders in your eyes, leading to more serious problems too. For example, you should try to find the reason of red eyes. And then try some ways to avoid them. In common, you can just have some warm compresses which can be done in a long term. And that can be effective. Also, wearing a pair of eye patch is good too.
Your son's red eyes can be treated with some home remedies. You could let your son use the eye drops to release the symptom. The eye drops will be owned with the anti-inflammation role. In addition, you could let your son use the warm compress to make the eyes feel comfortable. In order to cure it, you should let your son keep on using the above home remedies.