Hi Dear,
Welcome to HCM.
Understanding your concern.
Thanks for your query. Basically
cyst id formed after infection . When the cyst is removed many times infection left behind which cause bump like structure after surgery .
The second reason for bump is that the cyst war formed due to dental infection . If the dental infection was not treated properly the lump can formed again due to dental infection.
As you mention in query that you are taking antibiotics and the condition is getting better that a good thing . You should continue your medicine and complete in properly .
It can be possible that lump will go away only with medicine without surgery .
If condition persist even after completing antibiotic course then again visit
dentist or oral surgeon for proper evaluation . Doctor will try to find out root cause of infection like dental infection and treat it accordingly.
Doctor may perform
root canal , extraction or curetage first to eliminate main point of infection and then remove the lump surgically or extend the course of antibiotics.
Hope your concern has been resolved.
Best Wishes,
Dr. Harry Maheshwari