Dear karip38: Skin on the breast is like skin anywhere on the body and is subject to a variety of abnormalities. This may or may not be related to the biopsy. Without evaluation, it is impossible for us to speculate on what this might be. Our recommendation is to see your doctor (or possibly a dermatologist) who can evaluate this “lump” and determine what the next steps (including possibly sending you back to the surgeon) should be. In the meantime, it is probably better if you do not try to squeeze this.