SUMMER'S HIGH humidity greets you like a warm, sticky wall in the morning. The allergy index is off the charts. Weather swings between whipping summer thunderstorms and blasts of skin-baking sun. Which all means that the mauve lipstick you wore at Easter looks a little silly right now. Summer calls for bright or bare. This summer, treat yourself to an updated, fresh look with the right wash of color at the office, a BBQ or the beach.