GIRLS! I've got a body question?

I didn't really know what category to put this in, but I need some girl-to-girl advice and I'm afraid/weirded out if I ask anyone close to me. Or a doctor... And I'm 16
I've got these red marks on my boobs, and they look like veins, but they aren't. They are bigger than a usual vein mark, like maybe 1/4 of an inch to a half inch... Is this normal? I've had these as long as I've had boobs, but they just now seem prominent. And Im worried... And it isn't from anything sexual, cause i'm a virgin...
GIRLS! I've got a body question?
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