COSRX BHA Blackhead Power Liquid is a leave-on exfoliating treatment designed to help improve the appearance of congested pores, blackheads and excess oil. Its BHA-based formula works within the pore area to help remove accumulated impurities and dead skin cells while supporting a smoother-looking skin texture. It is especially suitable for combination and oily skin prone to blackheads and congestion. COSRX recommends gradually introducing the product into your routine rather than using it too frequently at first.