COSRX BHA Blackhead Power Liquid BHA 블랙헤드 파워 리퀴드
One of the products that built COSRX's reputation, and still among the most recommended leave-on BHAs in K-beauty. It is formulated with betaine salicylate rather than salicylic acid itself — a gentler derivative Korean brands favour — in a fluid, slightly viscous base that layers under other steps without pilling. It is aimed squarely at the small, rough, closed congestion around the nose and chin rather than at inflamed spots.
What it is built around
Who it suits
Oily and combination skin with persistent blackheads and a bumpy surface texture. Because betaine salicylate is milder than straight salicylic acid, it is a sensible first leave-on exfoliant for people who have reacted badly to stronger formulas. Dry and sensitive skin should still start slowly. Ask a doctor before using any BHA in pregnancy.
How to use it
Evening, on dry skin after cleansing and before serums and moisturiser. Start two nights a week and increase only if your skin stays comfortable. Daily sunscreen is non-negotiable alongside any exfoliant. Keep it away from the eye area, and give it a few minutes to settle before the next layer.
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🙋 People also ask
What is BHA and what does it do?
BHA, usually salicylic acid, is an oil-soluble exfoliant that can penetrate pores to dissolve oil and dead skin, helping refine the look of texture and blemish-prone skin. In Korean routines it's used a few times weekly, with sunscreen by day, to avoid over-exfoliating.
What is the difference between AHA and BHA?
AHAs like glycolic and lactic acid are water-soluble and work on the skin's surface to brighten and smooth, while BHA like salicylic acid is oil-soluble and gets into pores. In Korean skincare both are used sparingly, a few times weekly, always with daily sun protection.
✍️ Written & reviewed by the KoreaPlus Editorial team — dermatologist-informed, cosmetic-science researched & source-cited. Last reviewed: 2026-08-23.
General educational information using cosmetic structure-function wording — not medical advice. Always patch-test new actives. © KoreaPlus.