From Wikipedia.org
QUOTE
Due to its excellent capability to penetrate skin, glycolic acid finds applications in skin care products, most often as a chemical peel performed by a dermatologist in concentrations of 20%-80% or at-home kits in lower concentrations of 10%. It is used to improve the skin's appearance and texture. It may reduce wrinkles, acne scarring, hyperpigmentation and improve many other skin conditions. Once applied, glycolic acid reacts with the upper layer of the epidermis, weakening the binding properties of the lipids that hold the dead skin cells together. This allows the outer skin to "dissolve" revealing the underlying, healthier, smoother, brighter-looking skin.
I think since Glycolic Acid removes dead skin cells, which is a cause of acne, it can help clear acne.
Glycolic Acid can be found in many lotions and exfoliants such as (click the picture)

Note: I will add more information later on, unless no one is really interested...



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