PHA PEELING GEL by BENTON. This gel-textured scrub contains cellulose, which physically exfoliates the skin, and PHA, a gentle acid that chemically exfoliates the skin. Among its ingredients, you will also find hyaluronic acid, which helps the skin retain moisture, and ceramides, which soothe and hydrate the skin. This gentle two-step exfoliating gel provides gentle physical and chemical exfoliation.