What Does Squishy Lump On Elbow With Discoloration Post Surgery For Broken Wrist Suggest?

I fell and broke my wrist...had surgery...that was about 7 weeks ago! The doctor said it s healing really well....physical therapist can t believe how good it is. About a week and a half ago all of a sudden I notice a lump on my elbow. It looked like half an egg. It was squishy. Didn t hurt. The next day it was really small. A few days later I noticed my elbow was black and blue and the black and blue was getting bigger. Now the coloring is clearing up but I still have a little lump. My next appointment is in 2 weeks with my doctor. Can I wait til then or should I see a doctor sooner. Could this be serious....doesn t hurt....black and blue almost gone.