My right arm is stronger than my left. Recently my left arm has ballooned from 1/4 inch bigger than my right to a full inch within a few months time. I work with dumbbells and try to use my right more but cannot seem to even get a pump going in the right no matter what I do. My left on the other hand seems to get a pump without any effort whatsoever. The same thing has happened to my chest in the past few months also. Could I have had something happen and not have noticed?