Hi nabber,

If the lump is dissipating and there are no clinical or radio graphic signs of infection, then it may be best to wait it out a few more weeks. If the lump reappears, you get swollen, develop pain ... then obviously don't wait to see the dentist.

Osteomyelitis does not necessarily show symptoms at the early stages. It can be asymptomatic for a long time. So the area should be monitored with a dental xray at your cleaning appointments to monitor the progress of the healing. This way if you remain asymptomatic but something does show up radio graphically it can be treated before it turns into a bigger problem.