I would think out of concern you would have him see a medical person either in the office or go to emergency....good luck
My Son's Penis Is Swollen What Is Wrong?
There are many reason possible but not knowing the age of you son it is hard to say
it would be best to take him to the doctor
My son is 6 years olds,why his under penis ball is getting big and hard
Your looking at your son's penis. That's whats wrong
Well, he could be masturbating too much. Maybe you should have a guy have a talk with him. He could get some serious infections if he does this too much, since he's rubbing the skin raw.