Scar tissue issues!!!

I had a belly piercing once before my current one. It rejected, so I had scar tissue. Very recently the scar tissue has become inflamed and almost like a bubble. I want to push that my belly piercing is NOT infected, and NOT rejecting. It is a healthy piercing, but the scar tissue above it is angry. How can I calm it down? Why did it do this? (It's angry in this photo because I took off the top ball to show the bubble isn't coming out of the actual piercing)