I had 2 teeth removed last Wed. and I have a large painfull lump on my jaw, not where the teeth were removed.  It was a very difficult extraction and it took 2 and half hours before they were able to get the impacted wisdom tooth out.  Could this lump be a blood clot?  I also woke up this morning with the bruise from my neck extending down to my chest.
Yes, your concern is very true. As u said extraction took 2 & half hr i.e. tissue handling is much more, this causes small vessels oozing postoperatively. This oozing produces collection i.e. blood clot (hematoma) as you correctly predicted. Also, tissue edema & inflammation causes an appreciable lump. Need not worry. In my clinic, I prescribe choral forte, enzymes that reduce tissue edema. Even without any medication, it resolves, just that it takes a little more time. Hope this information is useful to you. Thanks. Regards.