Vitamin C mask: blemish treatment, skin whitening blemish treatment and moisturizing mask. Add half a tea glass of cold water to the powder mask and mix well. When it reaches a gel consistency, immediately apply it to the skin with a brush before it freezes. skin temperature. It freezes in 1-2 minutes. After keeping it on the skin for 20 minutes, peel off the mask by lifting it from bottom to tip.