That said, you also can't go out in the sun with naked skin — and I don't mean bikini-less. You must wear SPF of at least 30 (I always opt for 50) and reapply throughout the day. Sizzling your skin in the sun will cause spots and wrinkles — neither of which will make you age gracefully. Plus, you could also develop melasma, a darkening of your upper lip caused by sun exposure (it looks like a mustache). Many of my late-20-something friends are now dealing with it. Self-tanner is your best mate, ladies!