Under-eye puffiness that persists several years after filler treatment can be frustrating, especially when it makes the area look swollen or uneven. Even though your filler was placed three years ago, it is possible for hyaluronic acid filler to remain in the tissue longer than expected and contribute to persistent puffiness. However, not all under-eye fullness is caused by migrated filler. At 68, changes in skin elasticity, fluid retention, and the natural fat pads beneath the eyes can also contribute to puffiness. It is important to distinguish between these causes before deciding on treatment. If the puffiness is caused by retained or migrated hyaluronic acid filler, hyaluronidase may be an option. This enzyme dissolves hyaluronic acid filler and can sometimes improve the appearance of the area. Treatment should be performed conservatively by an experienced medical professional because dissolving too much filler may create hollowness or reveal underlying volume loss. If the filler is not hyaluronic acid, hyaluronidase will not dissolve it. In addition, if the puffiness is primarily related to under-eye bags, loose skin, or impaired lymphatic drainage, dissolving filler may not fully resolve the problem. I would recommend an in-person assessment with an experienced dermatologist or facial plastic surgeon who can evaluate the area, identify the type of filler used if possible, and determine whether ultrasound imaging would be helpful. I would avoid adding more filler to the area until the cause of the puffiness is clear. The good news is that treatment options may be available, even years after the original injection. The key is identifying what is causing the fullness so the treatment improves the under-eye contour without creating new concerns.