A double chin, also known as submental fat, is a common cosmetic concern where excess fat accumulates beneath the chin, creating the appearance of a second layer. It can develop due to factors such as weight gain, aging, genetics, and poor skin elasticity. As we age, the skin loses collagen and elasticity, making it easier for fat to sag in this area. While excess weight can contribute to a double chin, even individuals at a healthy weight may experience it due to genetic predisposition or natural fat distribution. This condition can affect facial contours, leading to self-consciousness and frustration for those who desire a more defined jawline.