Rejected belly piercing scar removal treatment options? (Photo)

I got a belly button piercing almost two years ago and it started rejecting about half a year after i got it. Afterwards i was left with a scar right above my belly button. I’ve tried using scar medication as well as silicone bandages which has helped the area flatten out but it’s still darker than the rest of my skin and noticeable. what other treatments is possible to help fade this or remove it? thanks!