Had dental work done and the left side of my face swelled up. after a week it went down but i have a soft bubble full of liquid on my gum by a molar?

Evaluation: Without knowing what treatment was rendered, if you were already infected, or your health history, the best advice is to have your dentist evaluate the swelling.

Infection: The swelling was a build up in pressure in the bone. When the infection created a hole in the bone the buble of pus formed under the gum looking for a way to vent the infection. Probably will need RCT or extraction or treatment for a periodontal abscess. filling deep cavities can seal in a dying nerve and cause this type of acute flair up. Get to the dentist for care