Vitamin C mask (Ascorbic acid L-) is a powerful antioxidant and is known as a required component in the production of collagen, which is what provides skin its suppleness and elasticity.
Vitamin C has also been shown to help reduce the appearance of age spots while providing some protection from external environmental stressors.
Scoop a tablespoon or two into a bowl & add water or hydrosol/ floral water by teaspoon & blend into a smooth paste, spread on face in a thin layer & leave on for just a few minutes. With a warm facecloth or hands, massage water into the mask to gently remove it.
Follow with a mild toner & or soothing cream. If this mask stings too much to bear remove it right away - it won't get better if you wait.