A spot treatment serum to promote an even skin tone. Hydroquinone-free formula for those who are unable to tolerate hydroquinone Highly effective for all types of uneven skin tone How to use: After cleansing, spot-treat with a thin layer and allow to penetrate. Follow with any other appropriate PCA SKIN® corrective products and broad spectrum SPF product in the daytime, and moisturizer in the evening. Ingredients: Phenylethyl resorcinol - an antioxidant that promotes an even skin tone. Azelaic acid - helps promote a clear complexion and an even skin tone. Kojic acid - helps promote an even skin tone. Full ingredient list: Water, Alcohol Denat., Hamamelis Virginiana (Witch Hazel) Water, Lactic Acid, Butylene Glycol, Kojic Acid, Azelaic Acid, Alcohol, Hydroxyethylcellulose, Phenylethyl Resorcinol, BHT, Glutathione, Silybum Marianum Fruit Extract