A double chin, also known as submental fullness, is characterized by the accumulation of excess fat beneath the chin.  This can be caused by a combination of factors including genetics, aging, weight gain, and poor posture.  The appearance of a double chin can affect facial harmony and contribute to a less defined jawline.

Several treatment options are available for reducing the appearance of a double chin.  These include lifestyle changes like diet and exercise, as well as non-surgical procedures. In some cases, surgical procedures like liposuction or a neck lift may be considered.