Stomach line crease?!

Question: i just noticed i have 2 horizontal lines on my belly. (where the stomach creases while sitting down) it goes away when i wake up, but even if i sit up straight it shows back up. what is it? have u seen it before? tips to get rid of it?

also, im thin..(5'5 115 lbs.) so its not cause im fat ;)

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Answers: i just noticed i have 2 horizontal lines on my belly. (where the stomach creases while sitting down) it goes away when i wake up, but even if i sit up straight it shows back up. what is it? have u seen it before? tips to get rid of it?

also, im thin..(5'5 115 lbs.) so its not cause im fat ;)

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i have no clue. but i have that too! one above and one below my belly button and its red. im 5'8" and 125 lbs. i guess its normal?

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its normal,
it from where your skin lies because the muscle.
its hard to explain :D

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