The jaw is actually a part of the body where lymph nodes can easily become enlarged, and the first thing that comes to mind when something hard suddenly appears in this location may be a localized lymph node enlargement. For further clarification, it is recommended that the patient should go to the hospital for an ultrasound examination. Because most of the swollen lymph nodes are caused by inflammatory reactions, other causes cannot be excluded. In addition to finding lymph nodes, ultrasonography can also identify localized subcutaneous occurrences such as localized lipomas, localized fibroids or sebaceous cysts. Usually, ultrasound examination can make a better judgment and patients do not need to be nervous.