Hello and thank you for your question.
Based on your description it sounds like you have an infection in your wisdom tooth which has spread to the buccal space in your mouth and has caused this area to swell up. It is very important to go into the dentist
to get a Panoramic radiograph, vitality testing in the teeth and determine if extractions are necessary, or you need an immediate incision and drainage
with antibiotic therapy to get the infection under control.