Frustrated with stubborn blackhead?? The Cosrx BHA Blackhead Power Liquid is clinical proven to reduce the formation of blackheads and removing excess sebum while hydrating the skin. This is also infused with several botanical extracts which gives you brighter and fairer complexion. Apply small amount and focus on blackhead area (avoid under eye area) in morning or evening after washing your face. Remember to apply adequate sunscreen if used in the morning.