The L'Oreal Paris Glycolic Bright Instant Glowing Serum Mask is an intensive, single-use sheet mask designed to instantly revive dull skin and reduce the appearance of dark spots. Powered by glycolic acid, an alpha hydroxy acid (AHA) known for its deep epidermal penetration, it gently exfoliates dead skin cells to accelerate cellular renewal and even out skin tone. Dermatologically tested and suitable for all skin types—including sensitive skin—this lightweight mask floods the skin with hydration in just 15 minutes, leaving the complexion noticeably smoother, luminous, and refreshed without any sticky residue.