I fell and landed on the front of my knee on moderately hard surface bottom of stairs. Immediate swelling, but ice reduced it. Now, week later, bruising pale yellow/green, but there is a lump with darker bruising at base of my knee cap, and it is quite painful to touch. What is this lump? It wasn t there initially, but now is accompanied by peculiar feeling of almost numbness. Not shatteringly disabling, but don t want that lump there.