Did you ever find out what the cause of this was? I have actually been experiencing the same sensation for the last 2 days or so. At first I thought I was imagining it, but the "vibration" feeling is definitely noticeable and present. In my case, it manifested after a weekend of heavy sexual activity. I'm assuming this is nerve-related and will probably resolve itself after a few days. But I have some concern.
It's also rather unfortunate that members of this forum choose to be childish and respond with idiotic comments rather than anything helpful.
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