SkinCeuticals BLEMISH + AGE DEFENSE is a targeted, oil-free serum for acne-prone skin with visible signs of aging, Blemish + Age Defense contains a potent blend of dioic, lipo hydroxy, salicylic, glycolic, and citric acids to exfoliate dead skin cells, prevent clogged pores, reduce sebum production, and improve the appearance of fine lines, wrinkles, and uneven skin tone. Formulated to improve acne without the excessive dryness or irritation commonly associated with traditional acne treatments, this serum is well-tolerated by most skin types.