I have a red line across my stomach when i sit down and my skin folds, it becomes a red line if I sit like over 10 or 20 mins then when i stand up for a few mins the redish color kinda fades a little but you still can see the line.
its just a line where your stomach folds over. it's just like the lines in the crease of your arm where it bends. they will go away when the fat goes away.