Cleanser, moisturizer and SPF are the basic skincare steps, but if you’re looking to up the ante on your routine, consider adding a serum to your lineup. Facial serums are highly concentrated and can help target your specific skincare concerns, from acne and dryness to anti-aging. To get more information on serums, their benefits and how to incorporate them into your routine, we consulted with board-certified dermatologist Dr. Raja Sivamani.