I have a lump in my left arm inside elbow where a nurse places stethoscope. It is hard and there is swelling around it. Also above collar bone?

Likely lymph nodes. It sounds like it could be some swollen lymph nodes since it is in multiple locations. Would consult with your pcp and look for possible underlying infection or another reason for some lymph node enlargement.

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Dull pain under left collar bone, slight lump in same area. I'm also having an issue with my left arm, feels slow an hard to move. Chest feels heavy.

Brachial plexitis. By your description, it may be that you have inflammation or compression of the brachial plexus, which are an accumulation of all motor and sensory nerves controlling the arm. This resides just under your collarbone e. Need to be evaluated by your doctor. Read more...