A lump causing pain may be a benign cyst, or something more sinister.
The problem with doctors here is they think they are gods, when in reality quite a few are incompetent shills for the pharmaceutical industry.
Several times, I have been prescribed medications which I did not want or need, or were actively dangerous for someone of my age. I have only once been asked for my previous medical history by a Thai doctor.
Telling them what the problem is, or questioning them, does not sit well with them.
I would suggest sending Sheryl a PM, she may be able to recommend a competent specialist.