Should I be worried?

Hi guys! My pup is about 10 weeks old and I noticed he had a hernia on his stomach. Whenever I touch it, it’s super squishy and after massaging it, it’s goes down, then it reappears again after a few minutes.

Is it an abdominal hernia and will it go away or is this something I definitely need to visit the vet for ?

If there’s any way I can prevent any more hernias, please let me know! Thanks!