Hi and welcome to HCM. Thanks for the query.
Well this is one of the signs of hernia and it can be sonsidered but this is nor so common in this age. more commonly we see umbilical hernias
. this lump can be just bloated stomach or some subcutaneous lesion such as fibrona,lipoma
. He should do ultrasound
of this lump and more detailed gastroenterologic work up if his symptoms persist.
Wish you good health. Regards