The fullness or small “mounds” between the lower lip and the mental crease can become more noticeable with aging as we lose volume and collagen and the tissues gradually change position. The appearance can also be influenced by the shape and activity of the chin muscles. There are several non-surgical options, but the best choice depends on what is actually creating the fullness. In some cases, a small amount of carefully placed hyaluronic acid filler can soften the transition between the lower lip and chin and improve the overall contour. However, adding filler directly into an area that already appears full can sometimes make the mound more prominent, so conservative treatment is important. If the fullness is related to muscle activity, Botox to the mentalis muscle may sometimes help soften the appearance and improve the contour. This is different from using filler and would not add additional volume. Skin-quality treatments that stimulate collagen, such as certain laser or radiofrequency treatments, may also help if laxity and fine lines are contributing to the appearance, although these generally provide a more subtle improvement. I would avoid automatically filling the mounds themselves without determining whether the issue is primarily volume loss, muscle activity, skin laxity, or a combination of these. Treating the underlying cause usually produces a more natural result than simply adding volume to the area.