I had fallen and gotten a large bruise on my leg a week ago.now there is a lump that is red, sore & feels hot.?

Posible Infection: A bruise is a hematoma resulting from bleeding into the soft tissues. It is a good medium in which bacteria can live and grow. It is possible, even without a break in your skin, that the hematoma has become infected. The redness and heat are sign of a localized infection. You should have it checked by your primary care physician.

See doc: Likely just old clot/hematoma, but occasionally this can become infected and need to be drained. Soc needs to see.