BHA (Beta Hydroxy Acid)
BHA (Beta Hydroxy Acid) — an oil-soluble exfoliating acid best known for its ability to penetrate into pores and dissolve excess oil and debris. Salicylic acid is the most common example and is frequently used in products aimed at oily, congested, or blemish-prone skin.
Key points
- Because BHAs are oil-soluble, they can work inside pores as well as on the skin's surface.
- Salicylic acid is the most widely used BHA and is often included in products for acne and blackheads.
- BHAs can have soothing properties and are sometimes chosen for skin prone to redness or congestion.
- As with other chemical exfoliants, sunscreen use is generally recommended to protect exfoliated skin.
Frequently asked
Why are BHAs good for oily skin?
BHAs are oil-soluble, so they can penetrate into pores and help clear excess oil and debris that contribute to congestion. This makes them a common choice for oily and blemish-prone skin.
Can I use a BHA and an AHA together?
Some products combine them, but using both can increase the risk of irritation for sensitive skin. Introducing one at a time and monitoring tolerance is a cautious approach.
Related topics
This is a foundational entry in the SYNC Skin Encyclopedia and is expanded over time. Educational information only — not medical advice.
