Does A Bubble On The Site Of Double By Pass Need Another Surgery?

My hubby had a Double By Pass with Vaule and surgery was Great and it started to get close and good clean it all the time a Bubble came up very Small and think nothing of it and the next night Bubble Gets really Big so I get him to the hospital now they wish to go in for sugery aging but they get him meds to fight the infection he doesn t feel any Pain he feel better but they still wish to go for surgery any way but he thinks they cut into him aging he come Back aging Plus are their test they can do to see if it s infect why do a surgery now if he feels great and they are not sure if still infected this seems to be not need to us are we wright are they?the Bubble now leak out and he feels better but they still hoping for surgery ?