Hi, I worried because I had a little ball in my right armpit. I had it for like a week it hurt but then went away. A day ago my right breast started to hurt today I have fever along with body ache and back pain. My breast is getting hard and feels a little hot to the touch. I tried to go to doctor today but he isnt available until tomorrow morning. Could it be cancer or an infection that went from the armpit to the Brest? ..is not the whole breast is the bottom left side.