I went to the dentist 3 days ago to have an extraction done on my left bottom molar it was infected everything went good. That night after the numbness wore off I noticed a lump on my left jawline close to my chin it was small I wasnt worried about it...It is now the size of a half dollar and it itches really bad and hurts when I push on it. It is on the outside. Please if you know what this is let me know thank you.