Large painful lump under chin and close to neck area. I have been diagnosed with possible infection due possible tooth issue. I have been on Amox, Keflex, Bacrim, Clymadycin, Augmentin and now Levaquin. ENT stated that it was probably a stubborn infection and presribed the last antiobiotic Levaquin. It seemed to be working but 5 days into treatment lump is now twice the size and painful. Any suggestions? Can this be cancer? If an infection doesn't respond to antibiotics than what is the treatment. I am DESPERATE!!! I am constantly fatigued and my stomach has been upset for now 2 months because of all the pills. Please if anyone has heard or had the same symptoms. I would appreciate any HELP!!!