Steroid injection to dissolve fat around belly button starting to indent? (Photos)

I had three lipo revisions. Done around my belly button,finally the Dr. Injected it with steroid and the lump of fat dissipated perfectly ,but not its started to go too much and now it's dented and looks bruised,it has been 6 weeks since the injection. Is it permanently dented or can it bounce back? Why is it starting to discolor?

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