Ok so today when I was changing I noticed a large red pimple like bump on my left breast. It's about an inch away from my areola, so more like the top part of my breast. It's kinda sore to the touch but not really painful. If I press on it, it feels like a hard knot right under the bump. Has anyone had this? I'm hoping it's just a pimple or bug bite as I don't remember having it yesterday. Can a cyst develop that fast and look like a pimple? Of course me being a hypochondriac I also wonder if it can be breast cancer, although I dont think breast cancer lumps can be seen by the naked eye. I had a full physical with breast exam in July so I'm hoping it's nothing serious but I'm starting to worry! :(