AHA vs BHA
AHA vs BHA — two families of chemical exfoliants distinguished by how they interact with skin, with alpha hydroxy acids (AHAs) being water-soluble and working on the surface to smooth texture and tone, while beta hydroxy acids (BHAs) are oil-soluble and can penetrate into pores. The choice often comes down to whether concerns are surface-level or related to congestion and oil.
Key points
- AHAs such as glycolic and lactic acid are water-soluble and target surface texture, dullness, and uneven tone.
- BHAs, most commonly salicylic acid, are oil-soluble and can work inside pores, making them well suited to congestion and oily skin.
- AHAs are often favored for dry or sun-affected skin, while BHAs are popular for blemish-prone and combination skin.
- Both increase sun sensitivity, so daily sunscreen is especially important when using either type of acid.
Frequently asked
What is the main difference between AHA and BHA?
AHAs are water-soluble and exfoliate the skin surface, while BHAs are oil-soluble and can reach into pores, making BHAs better suited to oil and congestion.
Can I use AHA and BHA together?
They can be combined or alternated, but doing both at once may increase irritation, so many people introduce them gradually and pair them with sunscreen.
Related topics
This is a foundational entry in the SYNC Skin Encyclopedia and is expanded over time. Educational information only — not medical advice.
