Its genetics. My grandma had them. My mom, one aunt, and one uncle have them. So needless to say I was super worried I'd get them. I've been lucky so far and only have one that's slightly coming through behind my knee. This is after 3 babies. They say the more muscular your legs are the less likely you are to get them.
I have a few but my first was a boy and so is this one so I don't have a comparison. I was told like stretch marks they have more to do with genetics than anything else.
Its so funny. I think I got mine from my husband. His family gets them, but mine doesn't. Lol
Two girls, and now this one, sprouted new patches and the boys nothing. The girls take after my husband, and the boys my side. I played college softball and still play volleyball and soccer (I teach phys ed), so the muscle thing cant be it. Maybe my girls are thicker blooded....who knows?!
I just noticed a huge one in my calf. No others that I have seen, thankfully. But I feel the same way!! I don't want to wear capris anymore because it looks awful. A big buldging blue wiggling vein. It's so a la Hitchcock. Boooo!