Hello there we understand your feeling and your concern regarding your son but see there are hardly no chances of hernia surgery failure because it has been inky 2 days and the swelling might be because if the fluid accumulation beyond the suture and that which is presenting as swelling. There is no need if worrying about this. It will be a complete success and give it some time to heal. And mire over any surgery will have swelling writhing 5 days of sugery. Thank you