
What Causes Large Sore Bump On Arm?

Shoulder dislocation or separation / ligament
Detailed Answer:
Thank you for asking
Shoulder bumps that acute of only few hours history are likely bone related problem like dislocation or separation of the shoulder. It usually restricts movements or increase pain on movements. It may not be severe depending on extent of damage, ligamentous rupture of collar bone may also present this way.
Anyways it needs thorough exam and assessed by an orthopaedist in ER and slight work up like X rays might be needed here to correlate it further.
To me it looks like a ligamentous sprain which are easy to occur in age past 50. Get a orthopaedic exam and let them take it from here.
Take good care of yourself and don't forget to close the discussion please.
may the odds be ever in your favour.
Regards
Khan

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