What Does Skin401 2% Salicylic Acid BHA Purifying- Pore Tightening Anti-Blackhead Tonic Do? Thanks to the Salicylic Acid it contains, it helps reduce acne scars and prevent acne formation while purifying dead cells. Thanks to Tea Tree, it soothes the skin and reduces the appearance of pores. It maintains sebum balance and moisturizes the skin. It is suitable for combination and oily skin. How to Use Skin401 2% Salicylic Acid BHA Purifying- Pore Tightening Anti-Blackhead Tonic? It is used only once in the evening in the skin care routine. It is applied to clean skin, excluding the eye area, using cotton. Avoid contact with eyes.