Salicylic Acid is a great kertolytic which means it helps loosen the bonds between skin cells to promote exfoliating. It is the only hydroxy acid which is oil soluble which allows it to penetrate into clogged pores. It can be used more frequently than the other peels without must risk for irritation. The 30% solution For use only after you have acclimated your skin to the 20% peel. LIGHT SCARS AGING SKIN WARTS ACNE VULGARIS LESIONS UNDER THE SKIN (TRAPPED OIL) LIP CREASES LIGHT SCARS HYPERPIGMENTATION WHITE SPOTS BLACK SPOTS LIVER SPOTS SUN DAMAGED SKIN CONTROLS ALL TYPES OF ACNE DULL AND WORN SKIN