What are the causes of a lump under your jaw on the right side of your neck that let out pus in your mouth?

Answer 1

That would be a periapical abscess. The tooth it is associated with is dead, you should have a root canal or extraction a.s.a.p. Waiting too long will allow the recurrent infection to break down the bone supporting the tooth and the long term prognosis of a root canal will be diminished. Having a long standing recurrent infection can also cause numerous other systemic problems and risk blood sepsis if the infection is released into the blood stream. Go to your Dentist, get an X-ray.

Answer 2

When you have an infection your lymph glands work to correct the situation. You have lymph glands right where you're describing the lump. When lymph glands are working, they tend to enlarge and can be tender. you probably have an infection. You should see a dentist or ENT specialist to see what's going on.

Answer 3

A soft lump under your jaw on the left side that is swollen and tender is most likely a lymph node. These are an important part of your body's immune system and react to illnesses by swelling, becoming tender as well. If the condition persists for more than a few days, check with your doctor.