What are these lines on my hips?

Can anyone tell me what these lines are? When I Google it all I get are results for stretch marks and I don’t think it’s those. I know what “normal” stretch marks look like as I have them on my butt but im just confused as to what these lines are
Not sure if other women have them, but recently as low rise jeans are coming back into style, I’ve noticed a lot of women don’t have marks like this (from what I’ve seen.)
Any help is appreciated.

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