Weird sensation under arm

[Jayhawks17]

I'm about two weeks post-op right now, and a fair amount of lipo done.  Occasionally while walking I'll get this weird feeling on my left side (under the arm).  I'm having a hard time finding a way to describe it.  It's almost like a tremor, or like a the feeling of a bubble popping under the skin.  It's not painful per se; it almost tickles. The only way I can really get it to stop is by tucking my left arm tight against my body, or holding the area with my other hand.

As I said, this is not painful.  I don't like the feeling though, probably because I'm at a stage where I'm paranoid about every little pop or tingle.  Has anyone ever heard of or experienced anything like this?