at the beginning of this week, i began volleyball tryouts and thought tht the sweat i was giving off was heat rash. but now its a week later and under my armpit, and below, on the side of my breast, there are still medium sized lumps, that resemble pimples, except more 3D. there is one on the side of my left breast that is extremely painful, bigger than the other ones, and extremely red. I don't know what it is, but it puts me in pain whenever i have to wear a bra.