In polar vortex, skin pasty after a winter spent – or uber-pale just because you keep out of the sun even its shining due to an irrational fear of wrinkles. With a freckled and red-headed Irish ‘Nana’ who taught my mom that well before sun was en vogue, she should fear it, I grew up thinking that before leaving the house, everyone lathered SPF from forehead to feet. Even in the dead of winter and even in NY. You’re more likely to suffer from seasonal affect disorder than…