When it comes to exfoliating acids, most people are familiar with glycolic or lactic acid. But if those have ever left your skin red, stinging, or overly dry, there’s another option worth knowing: mandelic acid . Derived from bitter almonds, mandelic acid is part of the AHA (alpha-hydroxy acid) family, but it has one unique advantage—it has a larger molecular structure. That simply means it penetrates the skin more slowly, making it much gentler and better suited for sensitiv