I have a red bump located on the underside of my breast. It has a dark center, more purple than black. This is the third bump that has appeared, practically overnight. It hurts a little, especially if touched. The first time I expired this bump I pierced it and it released blood, but left a dark spot on my skin where the center was located. The second time I left it alone and it disappeared after about 3-5 days. I m pretty concerned since this is the 3rd time its happened in about 4 months.