Working in up to two hours, the trending COSRX The Alpha-Arbutin Discoloration Care Hydrogel Mask transforms from a serum-infused mask to a transparent sheet, helping to minimise the look of unwanted pigmentation. Infused with niacinamide and NAG, the formula helps to improve the skin's clarity with a more refined and all-over even appearance. Alpha-arbutin brightens the overall look of the complexion with enhanced radiance and luminosity. Enriched with glutathione and ferulic acid, the mask reveals a glass-like glow.