What should I do about skin blemishes after removing foreign body from chin with cannula?

I had fat grafting done 10 years ago
 and it became calcified so I had surgery to remove it
 . The first time was done without an incision using a cannula,
 but there was still a lot left,
 so the second time was done by making an incision on both ends of my chin.
 
But after the cannula was removed the first time,
 it became sunken and bumpy as you can see in the picture. It’s
 like that normally and it gets more sunken when I move it
 . I don’t know if it’s a scar, fascial adhesion, or just a biobond that disappears over time.
 The hospital said it’ll get better if I wait, but it’s already been a year.
 I think they’ll tell me to get fat grafting, but I want to avoid that.
 What should I do to get better in that condition? ㅠㅠ