Under-eye filler, also known as tear trough filler or under-eye rejuvenation, involves the use of dermal fillers to address hollowing, dark circles, and bags under the eyes. This treatment targets the area between the lower eyelid and the upper cheek, known as the tear trough, which can develop hollowing or a sunken appearance due to aging, genetics, or other factors. During under-eye filler treatment, a healthcare provider injects filler into the tear trough area using a fine needle or cannula. The filler material is typically made from substances like hyaluronic acid, which can help add volume and smooth out the under-eye area, reducing the appearance of hollowing and dark circles. The goal of under-eye filler treatment is to restore volume and contour to the tear trough area, resulting in a more refreshed and youthful appearance. This can help improve the appearance of dark circles, reduce the appearance of under-eye bags, and create a smoother transition between the lower eyelid and the upper cheek.