Hi, I was recently bench pressing at a gym. I happened to be wearing a sweater which was zipped about where my sternum was. When I lowered the bar, it hit the zipper causing impact on my chest. I immediately felt the pain in my sternum. A few days went by, and I noticed what will looked like a pimple. I thought a head would form but I eventually realized that it was no pimple, but a swelling caused by the impact. The swelling has somewhat subsided but I am still worried. Is this a symptom of a fracture or a broken bone. I can still breathe fine with no pain felt as I do so. What am I to do? I'd appreciate someone's help on this.