Collagen eye mask is a skincare treatment designed to target the delicate skin beneath the eyes. It typically comes in the form of gel or fabric patches soaked in serum and is applied under the eyes for 10–20 minutes. These masks are enriched with ingredients like hyaluronic acid, caffeine, collagen, and peptides to reduce puffiness, dark circles, fine lines, and signs of fatigue, leaving the under-eye area refreshed and hydrated.