I have been thinking about getting breast augmentation for a couple of years now, but I have been worrying about a few things lately. When I was younger, I got my belly button pierced and my body rejected it. I also have had knee surgery and a screw was placed in my knee cap. After a year, the screw started to hurt and caused me numerous problems. The doctor told me that it was probably infected and it needed to be removed. I have been worrying that if I did get a boob job, my body could possibly reject the breast implants or cause an infection. Is this possible?