Hydroxy acid is a common term used in the skincare industry. However, there are different types of hydroxy acids, each with unique properties and benefits for the skin. Some common synonyms for hydroxy acid include alpha-hydroxy acid (AHA), beta-hydroxy acid (BHA), and polyhydroxy acid (PHA). AHAs are water-soluble acids that exfoliate the skin's surface, improving texture and reducing the appearance of fine lines and wrinkles. BHAs are oil-soluble acids that penetrate deep into the pores, dissolving oil buildup and treating acne. PHAs are gentle exfoliants that hydrate and brighten the skin while also providing antioxidant protection. Understanding the different types of hydroxy acids and their benefits can help you choose the best skincare products for your needs.