How do I know if these are bart marks or just stretch marks?

I've not seen pictures of mine. only pics of the reddish colored ones, mine are white, they look like stretch marks but maybe they aren't?? all of a sudden my butt, yes my butt is covered with these marks! ughs!

I"ve had 2 kids and only had stretch marks on my hips. do bart marks appear anywhere on the body or just certain areas? and are they always that reddish color(my doc won't test for co infections, I doubt I"ll be able to order the test myself, btw, how much does it cost to buy the test from igenx? I couldn't find any prices.

now my other mark, it's on the back of my thighs. looks like a dent. on the left leg, it goes up from the middle of where i would bend my knee goes up at a diagonal direction a few inches. When I run my fingers across my leg, I can feel my fingers sink in that dent....that doesn't happen on the opposite side. oh my right leg, it goes up just a few inches from where I would bend my knee, definitely fingers sink in.

at first I thought maybe it s muscle definition?? but I"ve never heard of it looking like dents that you can sink your fingers into????

I asked on another board and was told it sounded like a Bart mark, however, I can't find out anything, and I googled all day!!

if you've experienced this or know where I can find info please let me know!