Perfects acne-prone skin and improves blemishes! The serum for problem skin, acne Mario Badescu Clarifying Serum with Azelaic Acid cares for your pores, purifying and tightening them without stripping your skin's natural oils. Skin appears soothed and healthy in 4 weeks, with fewer blemishes and a more even complexion with fewer dark spots thanks to the azelaic acid-enriched formula.