As per the information provided by you it seems that your child has got
episcleritis. Episcleritis is irritation and inflammation of the episclera, a thin layer of tissue covering the sclera of the eye. It occurs without an infection. In this condition patient feels no pain but do complain of discomfort in eye. By and large it is benign condition and very rarely associated with systemic condition. It will resolve on its own in 2-3 weeks. Recommended treatment is
NSAID eye drop or mild potency
steroid like Fluromethalone acetate (
FML) 3 times a day for 1 week and then tapering. I will advice you to get your son examined by some ophthalmologists before starting medications. As examination findings is the ultimate answer.
Hope this helps