Still have fluid/seroma on my stomach 4 months after having Tummy tuck procedure. What should I do to correct this??

I had a tummy tuck January 27, 2015. I am now 4 months out and still have a lot of fluid on my stomach or seroma. It looks like I am about 4 months pregnant. I have had it drained by needle and syringe twice now. The last time was just a couple days ago and he took a liter of fluid off my stomach. It has already started to recollect and harden. I am tired of going through this and want the results I was hoping for. What should I do or what should be my next step???