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Why do i have a line/crease on my stomach

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I have a line/crease that is about 3 inches below my belly button and goes across my stomach.
I'm not and have never been pregnant. I'm slim and my stomach is pretty flat.
It never looks red. Its pretty much the same color as the rest of my stomach.
Also, i'm about 90% positive its not from sitting down and slouching.
I hope someone is able to answer this for me, thanks!