Stomach creases ? How do get rid of them?

I have this crease on my stomach from having bad posture, i don't anymore, but the crease isn't going away, and its kinda embarrassing, I've tried bio oil , but that did work, any ideas how to get rid of it ? Please help. thanks. heres the pic, and no im not fat, never was. im 5'3'' and 110 pounds 2 years ago I was only 86 pounds. http://i54.tinypic.com/fmj5w3.jpg