I started noticing a tingle, on the top part my left arm. At first, when I would feel it, I thought it was an ant crawling on me or a long air blowing accross my skin. That s how light I felt it. Weird really, so many other things going on and now because it is summer, going sleeveless I am constantly brushing my arm off making sure there is nothing there. It started on Wednesday and today is Sunday. I put on short sleeve shirt today and didn t notice, should I be worried?