HI,Welcome with your query to HCM.
Based on the facts of your query,the cause of the burning pain in leftarm needs clinical evaluation from your Physician by a
Second Opinion,as all your tests are normal.
The trapezius lump spot is not hurting you,hence it does'nt seem to be causing the burning pain in your left arm.
Your burning pain mostly is undiagnosed burning pain and is coming from Neuritis/Compression neuropathy of the nerves supplying the left arm.
Neurontin /
Neurobion could help you.
Hope you got the answer for your query.
Hope this would help you.
Welcome for any further query in this regard
Will appreciate writing your feedback review comments,to help the needy patients like you at HCM.
Good Day!!
Dr.Savaskar,
Senior Surgical Specialist
M.S.Genl-CVTS