6 weeks post op lipoma removal on scalp, experiencing recurring swelling (thick blood). Thoughts? (photo)

I had a minor surgery to remove a lipoma (4cm) on the crown of my head. The procedure was supposed to be 10 minutes but took almost an hour because it turned out that the lipoma was covered with lots of blood vessels (angiolipoma?) Since the surgery (6 weeks ago) ive had a golf ball sized swelling on my head. The doctor initially told me would resolve in the first 2 weeks. Ive had most of it drained by doctor (it is thick blood) but within 12 hours it is golfball sized again. Any thoughts?