Pigment Balancing Peel by SkinCeuticalsR, formulated with 40% Glycolic Acid, reduces the appearance of hyperpigmentation and other signs of photo damage and uneven skin tone. Easy exfoliation with little to no downtime is achieved through the synergistic action of alpha-hydroxy acids that both lighten and inflame the skin. The optimal number of treatments is 4, and they should be spaced out every 4 weeks.