If you haven't already, I'd consult with my doctor to make sure it's not an infection.
I've had 3 bone marrow biopsies for Multiple Myeloma, the 2nd one did not go smoothly --the nurses were digging around in my bone for 1.5 hours and were unprofessionally rude. But I healed just fine. The spot was sore for a few days when I laid on it.