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There are a few possibilities with the symptoms as you describe them
1. Viral upper respiratory tract
infection (URTI) or common cold
. It may be associated with a red eye. It should resolve along with the infection. Maintain good hygiene. Ask your son to avoid rubbing his eye. Warm compresses and steam inhalation will help.
2. Allergic conjunctivitis
. Your son may have developed an allergic conjunctitivitis. You should consult a pediatrician
(and if he /she refers, then to an opthalmologist) because allergic conjunctivitis will require some eye drops.
3. Vision problems. Too much rubbing and red eye can be present with vision problems. But since the problem has been recent and not a chronic one, it is unlikely.
4. Foreign body in the eye can also lead to red eye. wash his eyes with water. Consult your pediatrician and/or ophthalmologist for getting to the right diagnosis
Hope that helped
God bless you