I had blood drawn a few months ago, upon leaving the doctors office I developed a huge knot that was red and puffy in my arm . I went back to the doctor within 10 min and they put ice on it. I still have a small knot in my left arm and from time to time it is still a little painful. What could have caused this and what can I do to get it to go away?
Asked On : Fri, 1 Feb 2013