I heard you get the red line on your stomach once your loosing weight not sure thought I used to have it a couple of times and I'm always doing sports and stuff...
i know everyone is being a dick, most of my weight is in my legs from biking, skateboarding, snowboarding. but my abs dont get a work out so i got a belly
lol, it could be stretch marks in which case they won't go. You can use cream to fade them away. It may be embarassing getting the cream as it's mainly for women who have stretch marks during pregnancy. I had to use it as I had them on my shoulders from muscle gain.
The skin In between your abs and Pecs? That always happens, its going to be a little flabby unless your on steroids or can honestly say you eat less then Nicole Richie.