welcome to HCM. If you have some doubt about hernia
then you should visit a general surgeon
. but the diagnosis can also be done by a general physician so thats also the option. Does he have any bulging on coughing? Perform this simple self examination. usually injury
cant cause hernia....but since there is swelling, he has to take the general treatment ie. some antibiotics, painkiller etc.
Wish you good health.