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Off-topic TalkWhere overpaid, underworked S2000 owners waste the worst part of their days before the drive home. This forum is for general chit chat and discussions not covered by the other off-topic forums.
definitely from bad posture. Look at the way you're sitting righ now and see if you can see the crease. Mostly likely yeah, so now sit up straight, shoulders back, head up. No crease!
I doubt they're stretch marks since they usually are vertical in the abdomen region, so I bet they're just creases. Tone up your stomach and you should see them go away.