Sometimes, the cause of a double chin can be a tough mystery to solve, even for medical professionals. Below are the common culprits: Weight gain For overweight individuals, excess fat in the submental region (i.e. under the chin) is expected. In these cases, diet and exercise are usually recommended as the first step to reducing a double chin. Genetics For young individuals with a healthy weight, double chins can seem to appear for no reason. People can develop a lining of fat or extra skin under their chin due to genetics. Aging For mature individuals, a double chin can be a natural part of aging. As the face loses its collagen, muscle and fat pads, skin has less to ‘hang on’ to. As a result, it sags. This can happen on the face, as it can under the chin. So, sometimes, a double chin is actually the start of a ‘turkey neck.’ Anatomy Lastly, your issue could be merely the appearance of a double chin. It might actually be a small chin. When the chin bone is small, there is hardly anything to give it definition. As a result, it looks like part of the neck. In these cases, dermal filler is useful to help extend the chin, so that it looks more distinct from the neck. The best way to find a solution for your double chin, is to get the advice of a trained aesthetic doctor or technician.