My veins hide.

[Duppers]

14. I've always had them.

Phlebotomists call mine "rolling veins."

There are two gals "vampires" in my doc's office - when I walk in, they've look at each and one has said, "you're better, she's yours." I must have famous veins.
And I've had more than my share of black and blue arms from people who didn't know how to draw blood from me.

Finding a phlebotomist with expertise is key to not having to be stuck and dug into many times. Seriously.
Good luck!

ps. I look at my arm and cannot see any veins but the gal grabs my arms and starts pressing, sometimes hard, and sometimes slapping me until she finds a good one. "Ah, there it is." She's never has to dig into me as others do.