It is always to properly appreciate from only photos, but if it is only a bruise, then it will dissipate. It does not appear to be a burn, judging by photos only, since there isn't any blistering or skin slough. It may be a collection of blood under the skin (hematoma) or an area of necrosis. If it is necrosis, then one has to allow for the time to elapse to evaluate further.
Keep in close contact with your surgeon.
A bruise will heal. A burn will likely leave a mark. What type of liposuction did your surgeon use? Laser or Ultrasound? If yes then this could be a burn.
At this stage all you can do is care for the wound and allow your body to heal