The Fluid After Lipoma Removal Has Turned Very Hard and Produce Sharp Pains Sometimes, Normal?

I had a lipoma removed a month ago. The area around the incision was left swollen far beyond normal, according to some, but the doctors chose not to drain the fluid. Now, after 5 weeks the area suddenly turned very hard(before it was soft) and reddish/black in color. The surgeon who did the operation keeps telling me this is normal filling up of the cavity left behind. However, my primary doctor said it seems like a blood clot brought on by bleeding in the area. Recently, I have had afew sharp p