I can never decide which is more frustrating: an actual pimple or the mark it leaves behind. The emotional duress of dealing with an acne scar from a breakout that happened weeks ago is a mind-boggling experience, but the Murad Rapid Age Spot and Pigment Lightening Serum ($72) makes it easier to handle. A combination of glycolic acid and vitamin C fades spots while offering additional antioxidant benefits, so your skin can repair itself faster the next time you get a pimple.