BHA: Salicylic Acid
This is the acid you're probably most familiar with. When it comes to clarifying the skin and helping minimize breakouts, salicylic acid is a mainstay in the beta hydroxy category. It works to exfoliate inside the pore as well as on the skin's surface, which is why it's used frequently in acne products. It's also known to help calm inflammation, a trigger for many breakouts.