This is unusual: and It could even be dangerous. I would advise you to get a formal consult to explore this in detail. If you have been lifting weights or something, it could just be muscular so no harm in applying heat; but if it keeps up with this "throbbing", especially if you have ANY unusual sensations in arms, hand, or head, you should be seen by a clinician.
Answered 2/9/2016
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