A double chin, or even a triple chin is a highly common condition. In most cases, having a double chin is nothing to worry about, offering only cosmetic concerns. In this instance, a double chin, also known a submental fat is just a layer of excess fat that has collected beneath the chin around the jawline. When this layer becomes substantial enough, it can form a wrinkle or bubble effect that has the appearance of a second chin. Medically speaking, having a double chin is rarely a cause for major concern, however, a surplus of excess fat is never a sign of positive health.