Can I Use a Filler to Fix my Scar from a Belly Piercing?

Hello. I took out my belly piercing about 15 months ago. I still have a noticeable scar from the piercing because it got infected. The picture shows a big indentation from the scar. I was wondering if I could use a permanent collagen filler to fill up the hole that the scar left. But I realized that the hole appears bigger because I have a lot of fat in my stomach area. Thank you.