Hi! My Husband Is 59 Yrs Old. He Has Had

Hi! My husband is 59 yrs old. He has had a hurting in his jaw and left ear for a long time. His PCP doesn't seem to think its anything. But now, it's swollen, red, has a hard knot on the tip of his Right jaw bone and very sore. Hurts under his ear behind his earlobe and jawbone. What do you think it could be?