I have a painful lump in the lower portion of my upper left arm.  A doctor that looked at it said it is a tumor but not sure of the type.  I noticed it 6 weeks ago.  I also have a painess tumor (unknown of cell type) in my left arm pit.  Should I be concerened?  Both have grown fast and since noticing tumors, they have doubled in size.
Welcome to Chat Doctor. 1. Painless lump on the arm by location if it's at the joint it can be a ganglion.2. But else where on the arm and pain less - than goes in terms of lipomas (fat containing cells).3. To solve problem - I would have asked for an ultrasound scan - that would help to assess the nature of the lump, its source and its extensions. (both arm lump and axillary lump / arm pit)4. And if required an FNAC - fine needle aspiration cytology would be helpful to know the nature of the cells. The armpit / axillary region lump most probably an enlarged lymph node.5. So get an appointment and get the scan done and needful treatment done. Good luck Hope I have answered your query.Anything to ask do not hesitate. Thank you.