The Two-phase mask for problematic skin Derma Expert AC by Banobagi is una a two-phase mask specifically formulated for problematic skin. With una a combination of 25 g of the liquid phase and 2 g of the gel phase, it effectively works to purify, soothe, and reduce imperfections, visibly improving skin texture. The balanced formula regulates excess sebum without drying, giving a brighter and healthier complexion. Ideal for those seeking a targeted and gentle treatment for impure and sensitive skin.