Every since I got my teeth finished I keep getting a blister, or puss pocket on my gum, it is right under my back tooth. I try to pop it and it is so hard, almost feels like I have bone sticking out right there, there is a black dot, like pepper in the middle. When I pop it, some stuff does come out, kinda taste like metal. I am just wondering if it could be bone, infection, or maybe where I got the novovaine shot?
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It's possible you may have an abscessed tooth.

An abscessed tooth is a tooth that has a pocket of pus in the tissues next to it. Pus forms when the body tries to fight a bacterial infection. If the pus cannot drain, it forms an abscess .

What causes an abscessed tooth?

Damage to the tooth, an untreated cavity, or gum disease can cause an abscessed tooth. If a cavity is not treated, the inside of the tooth—the pulp —can become infected. The bacteria can spread from the tooth to the tissue around and beneath it, creating an abscess. Gum disease causes the gums to pull away from the teeth, leaving pockets. If food builds up in one of these pockets, bacteria can grow, and an abscess may form. An abscess can cause the bone around the tooth to dissolve.

What are the symptoms?

You may have:

Throbbing pain, especially when chewing.
Red, swollen gums .
A bad taste in your mouth.
Swelling in your jaw or face.
Fever.
A pimplelike bump (gumboil) on the cheek side or tongue side of the gum near the tooth.
Over time as the infection spreads, the bone in your jaw may begin to dissolve. When this happens, you may feel less pain, but the infection will remain. If you lose too much bone, your tooth will become loose and may have to be removed.

If you think you have an abscessed tooth, see your dentist right away. If it is not treated, the infection could spread to other parts of your body and become life-threatening.

How is it treated?

If you have an abscessed tooth, your dentist will:

Give you antibiotics to destroy the bacteria causing the infection.
Make a hole in the top or back of the tooth so the infection can drain. Usually this will relieve your pain.
If needed, make a small hole in the swollen area near the tooth to allow it to drain.
If the inside (pulp) of your tooth is infected, your dentist will have to do root canal treatment (also called a root canal). A root canal tries to save your tooth by taking out the infected pulp. If the treatment doesn't work, the dentist may have to remove your tooth.

Please see your dentist as quickly as possible. You should not wait any longer to get this taken care of.

Source(s):
http://www.everettclinic.com/kbase/topic...