Sorry to hear about your problem but the management plan decided by your surgeon is correct. Would it possible for you to tell me the BIRADS score mentioned in your mammography
report? It is a good indicator whether the lump is benign or malignant.
will give a definitive answer and you will have to wait for 5-7 days for the result. Was you nipple inverted since childhood or is it of recent onset. Recent onset nipple retraction is a warning sign. As you have not mentioned your age, it is difficult for me to tell you the various differentials but the main thing is to rule out cancer.
If you would like to clarify any other point, please feel free to ask me.