Had My Wisdom Teeth Extracted. Constant Pain. Swelling Reduced. Grown To A Pretty Big, Dark Red, Moveable Bump. Problem?

Hello. Last month I had my two bottom wisdom teeth extracted. Everything went pretty smoothly for the most part. Over the last month the pain has been non existent, swelling reduced, and no discomfort at all. That was until this past Monday morning when I awoke with the left side of my face swollen up to the size of a golf ball. I of course, went and seen the dentist that same day only for him to take two ex rays and have no idea what's wrong. It feels like a huge knot on my jaw bone. It is very painful and I can't open my mouth very much at all. The extraction itself has no problems, no pain, and no discomfort. However, last week I found a white dot (almost like a sore) on the extraction site (on left side, same side as swelling) and Monday the dentist said that this was okay. Today is Wednesday and I can feel that the "white dot" has grown and I managed to open my mouth wide enough so I could shine a flashlight back there to take a look and what I found is that it has indeed grown to a pretty big, dark red, moveable bump. It doesn't hurt so I'm assuming this is a good sign. Do you know what this is??? Is it normal?? And could anyone tell me what they think is causing the swelling on jaw line. It feels as if the dentist may have got a little too close to my jaw bone or had possibly hit it with the needle(s). Has that ever happened?