There are a few thing you can do to improve the appearance of the scars after a tummy tuch or really any plastic surgery procedure:
Be patient. Scars can take up to 12 months to mature and almost always look better over time.
Scar massage. Taking 5 minutes twice a day...
I agree with the other surgeons who have stated that liposuction or a previous disruption of the blood vessels long ago actually may improve the blood supply to your skin via a "delay" or neovascularization phenomenon. There has been some concern that past mesotherapy...
Go see you doctor. Its easy to tell. If seroma you will get fluid waves like in the ocean when you tap on one side. Look in a mirror. Tap The right side. Do you see a wave. Little seromas are hard to see but are insignificant so it does not matter anyway...