I was kindly given permission by one of our teachers to repeat a conversation she had in the cafeteria with one of her very young students today.
Child - "Why are your legs all blue?"
Teacher - (looking down at her legs) "Oh, those are my veins"
Child - "I don't have those on my legs!"
Teacher - "Yes you have veins too, they're just not as easy to see"
There follows a short lesson on veins, in which she shows him a visible one on the inside of his wrist - to his amazement!
As I said to her "Oh now that'll really make you feel better about your spider veins - not!"