Our firming serum contains lactic acid, salicylic acid, lactonic acid. It can help remove dirt and oil from deep within the skin, prevent pores from clogging, and keep the skin clean. Its application method is simple: 1. Clean facial skin and keep it dry. 2. Apply appropriate amount to face. 3. Gently massage until absorbed. Salicylic acid helps to close the pores, reduce the problem of enlarged pores, and make the skin more delicate and smooth.