Hello, two days ago I got a few small bumps on my upper back. Today there are plenty more, and they have white heads like acne, but im certain that it's not acne. I think it has to be a reaction to something but I am not sure what. I eat different things, and workout at the gym a lot and sweat. Any clue what may have caused this and what I can do to make it go away? I have taken benadryla few times, but that has not helped.