<s>[INST] For a year I ve had a rib shaped lump under my left breast. It starts just under and stick outs in the part where my rib connects to my sternum. The lower part of my sternum is also protruding quite a lot. I ve said it to 3 doctors and they ve all brushed it off as just the way my ribs are but it still scares me and makes me quite uncomfortable as they didn t even properly look or feel. Do you think it s worth getting another opinion? It does look like just a single rib sticking out at the part where it connects to the sternum but it just makes me feel uncomfortable with my body and worried it s a tumour or something [/INST] Hello dear , hiWarm welcome to Healthcaremagic.comI  have evaluated your query thoroughly .*  There are different  possibilities  for this lump as    -  sebaceous cyst  -  neurofiborma  -  lipoma  -  bony  growth  -  others .*  Needs  primary evaluation with x-ray , ultrasound  and  if  required  MRI    examination  for  the  definite  diagnosis  and  management  .Hope this will help you for sure .Wishing you fine health ahead .Regards . </s>