Hydroxy Acids are ubiquitous in aesthetic medicine. Alpha- and beta-hydroxy acids (AHAs/BHAs) are the most widely used ingredients for chemical peels; they have also become popular topical agents for antiaging, hyperpigmentation and acne. In recent years, they have been joined by polyhydroxy acids (PHAs) as a less irritating alternative for patients with sensitive skin. “I recommend AHAs for everybody—antiaging, acne, rosacea patients. It’s really one of the best things you can do for the skin,” says Monica L. Halem, MD, FAAD, a dermatologist in private practice in New York City.