It seems it sure would simplify things if you'd just go have a simple  biopsy 
and find out if the lump is cancerous or not.  Then you  could continue 
breastfeeding and quit worrying if it's not.  I've  had needle aspirations (not 
even very painful) of lumps after they  looked at them with ultrasound,  but 
mine were just cysts full of  fluid, thank goodness.
  
                                                                                
     Pat
  
  
                
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