First of all,the source of lump developed has to be ruled out.
if present has to be completely drained and curetted.
Since there was no pus within the lump,the growth can be cyst
Usually enucleation or marsupialization of cyst has to be done with great care to remove them.
Also make sure that the enucleation has done perfectly,if any small amount of fluid within the cyst may be left out to remove,it can result in recurrence.
I advice you to visit an oral maxillofacial surgeon and get a detailed examination and treatment thereafter.