I recently had a small tumor removed off my leg, and have a blood clot at the incision. .. The surgery was done in the doctors office, when I went back to get the 4 stitches out he said I had a blood clot, so he left a small hole at the end of the incisi

Hematoma. Blood collection at surgical sites are common and resorb with time they may liquefy and drain local heating pad (do not put on high or burn yourself) may expedite.
That. That is a good idea and as long as you don't get the solution in the wound should not hurt anything. If you develop increased pain, redness, or new complaints then please be re-evaluated by your doctor.