Hi,
your son is quite young yet to have problems like this. There could be many different causes for this. Some may include epdidymitis or orchitis, however that usualy happens to older males.
It is best to consult with a urologist. They might be able to give him an ultra sound to determine any abnormalities.
All the best,
Ron
Hello,
Have you taken him to see a urologist? It may be a good idea just to rule everything out.
I hope your little guy is feeling better.