Tear trough treatment is a cosmetic procedure used to improve the appearance of the area under your eyes. This area, called the “tear trough,” can sometimes look dark, hollow, or sunken, making you appear tired or older. The treatment often involves injecting a filler (a soft, gel-like substance) under the skin to plump up and smooth out this area, giving you a fresher and more youthful look. This filler is usually made of a substance called hyaluronic acid, which is naturally found in the skin. The procedure is relatively quick, with no or minimal pain and doesn’t require surgery.