Our azelaic acid facial serum contains glycerin and hydroxyethyl cellulose. It can penetrate deep into the skin, effectively relieve acne problems, reduce the formation of blackheads and acne, and keep the skin clean and healthy. Its application method is simple: 1. Clean facial skin and keep it dry. 2. Apply appropriate amount of the product evenly on the face. 3. Gently massage until absorbed. The salicylic acid component in the serum helps to accelerate the repair of dark lines, promote skin regeneration, fade dark lines, and restore the skin to an even and smooth appearance.