Observe: My guess is you are feeling the throbbing near the lymph node, not the node itself. It might be related to having the cold sore ... possibly related to nearby inflammation. I don't think it is immediately worrisome ... I think you could watch it a few days,
Answered 1/29/2017
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From cold sore: most likely inflamed node from cold sore. see your doctor if it persists
Answered 2/4/2015
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