Collection of fluid under the skin. Got a ltr out on Friday and it was all gone but more has appeared today, you glam tell its fluid from when you press it your skin ripples like a waterbed. It’s basically what’s normally collected in a drain after surgery but with a tummy tuck can keep coming back for a while. Think I’m more upset by the fact I know how they get it out now and it’s not nice, 3inch needle and a shringe! 🙁