hello and welcome to HCM forum,
the history presented by you suggests that you have got a tendency to get this lump again and again,
i would recommend that before getting it operated again just get the biopsy
done so that the cause of this problem as well treatment is well decided.
visit a oral surgeon or an oral pathologist so that biopsy can be done, do not worry there is treatment for this problem.
first of all knowing the cause is important.
i wish you good health,