honestly when my kids did that i had to giggle (shhhh) he may have some swelling or brusing just like what happens when u smash a finger u can give him a cool pack to put on it and possibly some childrens tylonal or motren as long as he is urinating like normal with no blood in it and the swelling goese down in a cpl days he will b fine
As long as he is fine or assymptomic do not worry....
carl66
I am assuming it was an accident , how old is he ? if he is in pain I would say take him to the ER to make sure he is okay ...