When you have oily, acne-prone skin, various spot treatments and zit-zapping face washes can be your skin-care BFFs. But if whiteheads, red pimples and blackheads still seem to be rearing their nasty heads despite your efforts, you may want to consider upping the ante with an acne serum. From salicylic acid formulas and calming face oils to formulas that help improve skin tone and texture, we’re rounding up our favorite blemish-fighting serums, ahead.