Above my right breast is a very painful lump. It s been there for years, on and off. It s been extremely sore now for over a week, and lastnight the pain under my right armpit woke me up. My right armpit is sore, my arm is also sore now, making my right hand a bit swollen as well. Not sure if this is all due to a minor cold I had for a day, on Monday. I don t normally get sick. Ice or heat? Not sure how to deal with it.