pus leaking from my belly butten

I had surgery 10 years ago, and every year or so this happens. A puss pocket will appear, it feels like a hard not, and hurts bad, then I will leak green ooze from my belly button and the pocket has popped. I flush with hydrogen peroxide for a day or so until it stops having even the slightest bit. I stuff cotton pads (the kind you use for makeup) inside so that while I am out nothing leaks. My Doctor said that is all I should do for it, this is just something that will happen. I dont really understand why.... its just somehting inside getting infected around the site where the surgery was and making its way out of the body.

I had surgery 10 years ago, and every year or so this happens. A puss pocket will appear, it feels like a hard not, and hurts bad, then I will leak green ooze from my belly button and the pocket has popped. I flush with hydrogen peroxide for a day or so until it stops having even the slightest bit. I stuff cotton pads (the kind you use for makeup) inside so that while I am out nothing leaks. My Doctor said that is all I should do for it, this is just something that will happen. I dont really understand why.... its just somehting inside getting infected around the site where the surgery was and making its way out of the body.