I would guess that you have the start of an umbilical hernia. The umbilicas is a natural weakness in the abdominal wall. You start to motice it as you get leaner because you don't have the same amount of omentum. It can be intestine that can become strangulated then you get peritonitis and get real sick. I would have it checked out to be sure.
I sell medical devices so I see this procedure either open or laparoscopic all the time. It's very simple.