If you are a woman with kids, and something on the back of your leg hurts and you wonder if it might be a varicose vein, don't ever, EVER use a mirror to look.
If you can't help yourself, find the smallest mirror in the world - maybe steal the one on the stick at your dentist's office - then go to the darkest corner of the house, take off your glasses, close one eye and squint with the other.
Since having children, horrible, sick and unspeakable things have happened to the backs of your legs. Not like car wreck horrible; "it's so awful, I can't look away," but actually post-traumatic-stress-disorder horrible that will leave you dreaming of how life was before you saw it.
Now you know. Go forth and spread the word.