I had a tooth pulled on the 2nd. my face immediately swelled up after the novacaine thought it was allergic reaction but my face is still very swollen, bruised and painful why? no pain where tooth was

Not from Novacaine: The experience you describe is inconsistent with a reaction to Novacaine. Swelling/bruising is common after tooth extraction, but should begin to improve within at least 5 days. Persistent swelling can be a sign of infection, but concomitant fever/pain would be expected. Update your surgeon if this persists.

You might have had: some bleeding from the needle used for the injection. If an allergic reaction probably some other signs and not bruising

Call the dentist: This should be reported to the extracting dentist. This could bean infection, or a reaction at the injection site where there was bruising of the muscle or tissues.

Bleeding: Most likely during the injection, a larger blood vessel was penetrated and blood leaked out into the tissue, happens infrequently, but it happens. Since you said it was immediate, no doubt your treating dentist saw it., what did they say it was? what did they say about how to manage it?

Normal complication: The dentist hit a blood vessel and due to the blood leakage into the muscle space it swells up a bit. it is one of the complications of local anesthesia called hematoma. It will take 3-4 days for swelling to disappear completely.

Pos. hematoma: Sometimes an injection into the oral cavity nicks a blood vessel which can produce these symptoms. It is not an exceptionally rare complication and results from blind deep injections into very vascular tissues. It usually resolves on its own without long lasting complications. Get back to your treating dentist for an evaluation to be sure..

Secondary trauma: now that the tooth is not the source of pain, your focus is on the area of the injection and the trauma of the bone that was needed to remove the tooth. This will resolve usually within the next 5-10 days. If the symptoms get worse you should return to the surgeon immediately.

See below: Go back to the dentist that performed the extraction to make sure you are healing adequately and do not need an antibiotic or to change the antibiotic.

Swelling: Depending upon the site, especially with an upper injection there can be many possible causes including a combination of causes. Some injections are in an area with the rapid injection of local anesthetic can cause immediate swelling until it is absorbed. Injecting into the buccal fat pad and/or bruising of a blood vessel can cause hematoma. Also secondary swelling from surgery due to trauma.