Clarify and renew your skin with the Cos De BAHA Salicylic Acid BHA 4% Serum. This potent exfoliant serum is formulated with a high concentration of Salicylic Acid to deeply penetrate pores, dissolve impurities, and effectively combat blackheads, whiteheads, and acne. It helps to control excess oil and promote a smoother, clearer complexion.