The SOME BY MI Yuja Niacin 30 Days Blemish Care Serum Mask is a highly-concentrated brightening sheet mask to help reduce blemishes and dark spots. The Yuja Niacin 30 Days Blemish Care Serum Mask from SOME BY MI is a powerful brightening sheet mask designed to be as effective as an entire bottle of serum! This mask is saturated in a dewy ampoule, powered by Yuja extract from beautiful Korean Seaside county Goheung, and is naturally rich In moisture, anti-oxidants, and Vitamin C. Also formulated with niacinamide and rice extracts to provide an extra boost to leave skin looking brighter and more even. The lightweight sheet is made from Derma Seal - a 100% cellulose environmentally-friendly fabric that feels soft and gentle.