I am not sure what you are asking. What type of procedure did you have performed? Was this for irregularities? Be more specific please.
Possible fat grafting
Fat grafting can be done to almost anywhere including the abdomen. The belly button would be my preferred spot for the tiny scar. Discomfort in the abdomen would be minimal, but where ever the donor site is for fat will be sore as any liposuction area is. Usually about 60-65% of the fat grafted will "take" and then be permanent which is why we over correct a little. Without more details I do not know what to say about knowing if some other operation was previously done or done incorrectly. Good luck.