I am a male and I take 300mgs of Bupropion daily which I started a month ago. This last week I developed kind of a knot on the right side if my chest, which was sore to the touch and felt bruised. After about three days it was gone, no sores or signs of it being there. Now I have developed on on the left side of my chest, same symptoms, a knot, sore to the touch and feels bruised. For lack of a better word or the medical term, both have been right behind the nipple? The only change that I can think of is I started Bupropion???