Weird marks on my back? What are they?

LaLa

New member
Okay, I went swimming one day when my mom noticed weird marks on my back. They are red, about 1 inch each, and they go up my back like stitches, except they are turned inward.
My mom assumed they were just those lines you get on your skin when you sit somewhere too long, but they never went away, and it's been two days now.
She then thought someone hit me, I have never been hit, so they aren't scrapes.
Now she thinks they are stretch marks, my boobs haven't grown at all, im still 34a, and I only grew an inch, in the last 2 months.
What could they be?
Im seeing a doctor I hope, but I just want your opinions before I go.
 
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