Hi Feri. Thank you for your question. It would be interesting to know what kind of doctor did your liposuction. I say this because liposuction is the one cosmetic surgery procedure that, in my opinion, is done by unqualified practitioners more than any other. Anyone with an MD may take a weekend course, buy the equipment, and start sucking away on Monday in their office. I have seen many cases where a doctor only removed fat from the lower part of the abdomen where there was a bulge but didn't touch the upper part. In those cases any weight gain will result in a disproportionate accumulation of fat on the upper abdomen. If that is the situation in your case then it would be an easy fix to go back and do it right but it should be done by a plastic surgeon certified by The American Board of Plastic Surgery. The only other possibility as has been mentioned is a seroma, or fluid collection, which is rare although it can happen. If your surgery was done by a board certified surgeon ten go back and see him/her so they can figure out what is going on and resolve it for you, If it was done by a non plastic surgeon then you would be better off going to someone else who is better qualified. I hope this helps.