Thanks for writing in.
Since it has been 9 months following your surgery, the healing of the are after surgery is almost over. You could wait for a. purple of months and the if your doctor is unable to guide you with a possible curative solution, meeting up with another doctor can be thought of.
The tissues should heal completely in a years time after surgery. This involves healing by formation of granulation tissue with clear and smooth scar formation. As you write about a large lump in the operated area, it is important to know what is the structure which is causing such a lump. An ultrasound
scan or CT scan
may help in knowing what's going on below the skin.
Hope this helps