As you have stated you seem to have probably developed an infection. However, the swelling that started from your jaw and has spread to your neck is concerning. It is important to know if the swelling is painful, if you have any fever
, difficulty in opening the mouth, any discharge, any lymph
node swelling and nature of swelling which can be determined on examination. Also you may require an FNAC of the swelling to determine its nature. The outcomes of these aspects will determine the further course of management.