unfourtunalty it seems to come with the surgery,,most gain an adverage
of 20 lbs
in a years time and seem to maintain that, all I can suggest is speak with your Dr about a exercise routine, what diet may work best for your metabolism ( a endocrinologist may be best for this as they can measure all hormones)
last resort if you have the money and it really bothers you would be cosmetic surgery such as lipo or a tummy tuck do NOT do this with out several consults and certanity nothing else will