At a BMI of 21, you’re within the normal weight range, but you can still have fullness beneath the chin that softens the definition between your jawline and neck. This doesn’t necessarily mean you need to lose weight. Genetics, chin projection, skin elasticity, and the distribution of fat in the area all play a role in your side profile. Submental liposuction may be a good option if the fullness is caused by a small, localized pocket of fat and your skin has enough elasticity to retract smoothly afterward. It can help create a cleaner transition between the chin and neck. However, liposuction won’t correct a recessed chin, significant skin laxity, or fullness caused by deeper anatomical structures. If your chin lacks projection, chin augmentation may help balance your profile. Non-surgical treatments, including injectable fat reduction or skin-tightening procedures, may be options in selected cases, but their effectiveness depends on the underlying cause and they may offer more subtle results. The most important step is determining what is contributing to the contour you’re seeing. I wouldn’t recommend choosing a procedure based on BMI alone or assuming that fat removal is the answer without examining the area. With the right assessment, it may be possible to improve your neckline while keeping your results natural and proportional to your facial features.