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SkinCeuticals Blemish + Age Defense Serum For Oily, Blemish-Prone Skin | 30ml - 2% dioic acid with an optimal alpha- and beta-hydroxy acid formulation to reduce the formation of acne and clogged pores, while improving the appearance of fine lines, wrinkles, and uneven skin tone.. An award-winning, lightweight, non-oily serum that helps reduce the appearance of blemishes and improve the appearance of fine lines and wrinkles. Blemish + Age Defense is a targeted, oil-free approach for aging skin prone to breakouts. This first-to-market acid blend combines 2% dioic acid with an optimal alpha- and beta-hydroxy acid formulation to reduce the formation of acne and clogged pores, while improving the appearance of fine lines, wrinkles, and uneven skin tone.