Popped blood vessel or stretch mark

[GymFirsttimer]

Are these popped vessels or scratch marks, noticed a day after the gym but could have been there maybe a week before. Been 5 days and still looks the same. Located on right side of back slightly above the middle. Please help :(

Look like strechmarks to me.

I think stretch marks. My 15yo has these across his back.

Look like stretch marks, over time should lose the the redness