Ruby pouts were the rage at Carolina Herrera. Catch scarlet fever with a red lipstick suited to your complexion. Choose cherry hues if your skin has blue undertones; poppy shades for coloring with yellow tinges. Opt for a matte texture—it's more wearable than a gloss. Lipstick: L'Oréal Paris Infallible Never Fail Lipcolour in Target Red, $9.99.