Lump under cheek bone, like a firm sac, runs in direction diagonally from ear to mouth deep down. could it be anything to do with a tooth/jaw infectio?

Yes: That's a very likely possibility. See your dentist as soon as possible as infections can spread quickly and cause serious complications.

Number of things..: There are a number of causes for this. You would want to visit with a dentist first to rule out the possibility of a dental infection. Your dentist will refer you to an ENT if there are other signs such as sinus or salivary infection that needs further evaluation.

Sure...: It just might be associated with an infection of a tooth or your gums. But to know for sure, you'll have to visit a local dentist. Make the call for an appointment.

Definitely, yes: A tooth abscess won't go away without treatment and the infection may spread to your jaw, cheeks, sinus and to other areas of your head and neck. A dental abscess is a collection of pus that forms in your teeth or gums as a result of a bacterial infection. Dentist will treat a tooth abscess by draining it and getting rid of the infection. Rec. See your dentist asap.