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I know it has been awhile since you made a comment.......but you seem to know what you are talking about and I am worried and just need advice.   About 1 1/2 years ago I found a small pea size lump under my arm that is painless.  The doctor said not to worry about it because it most likely a cyst.  Then 6 months later I went back because it had grown to a large marble.  He had me take an ultrasound that told me it is a solid mass.....not a cyst, but again sent me home and said it's nothing to worry about.  Then a few weeks ago I went back because I feel weak all the time and told him it's still growing.  He sent me to do another ultrasound and they confirmed that it has triples in size and it is still a solid mass but the tech said it isn't connected to my breast tissue or lympnode.  The tech said I should get a biopsy, but doctor said again not to worry about it and will not refer me.     Should I be concerned?  I don't know as much as the Dr. but the fact that it's growing and a solid mass concerns me.   Could this be serious?   Thanks much, Mother of 5- including husband ;)