I got a simple molar extraction on tooth number 17 due to a painful abscess on 11/12. now, i find a lump under the cheek/jaw area. could it be the same infection or should i see a dentist or a doctor?

Dentist: Start with a dentist. A simple dental cray should tell if there is something in the bone. If not they will recommend an appropriate specialist.

Enlarged lymph nodes: Is it external or internal lump .If externalprobably a lymph node that got enlarged due to the infection you had at that area .But anyways you should be checked by your dentist for a better evaluation to your situation

Start w dentist: There may be association to infected tooth that was removed. If there is a dental cause, you may have to see an oral surgeon. If dentist rules out relationship to infected tooth, or any other infection/inflammation of dental origin, he will refer you to physician. Let the dentist do triage for you.