Skin Perfecting 2% BHA Liquid Exfoliant rapidly exfoliates both the skin's surface and inside the pore, unclogging pores and improving skin's appearance. The result is a dramatic improvement in the skin's appearance, feel and function, which leads to healthier-looking skin and a noticeable improvement in the appearance of wrinkles. There is a great deal of research indicating that BHA (salicylic acid) drastically smooths the surface of skin. The lightweight liquid formula allows for a faster, but gentle, deep exfoliation rate than our gel or lotion BHA products, so it's an ideal choice for stubborn clogged pores. This product is 100% fragrance- and colorant-free with a pH range of 3.2-3.8. Every Paula's Choice BHA product is formulated with additional soothing agents.