question: I am 49 years old, 5'3 - 130 lbs.  have a hard lump on the outside of my left knee.  This knee has given me pain over the last couple of years, but the lump has really become larger over the last 6 months.  Now it is hard for me to straighten and the pain is almost constant.  Pain in also now going behind the knee on the left side.  The lump does not hurt and is not moveable like fluid.