If you have oily skin or active acne, alternating between the Lactic and Salicylic peels provides good results, and is not as harsh as the Salicylic or Glycolic alone. If alternating, apply them 3-4 days apart alternating between the Lactic and Salicylic. Salicylic alone is also very effective for oily skin. Using a salicylic cleanser in between peel treatments is also a good way to keep the oily skin down. Additionally Mandelic acid is also very effective and is a less harsh alternative to salicylic acid.