I kept picking at a zit in between my breasts not its slightly infected is polysporin (bacitracin and polymyxin) 3 antibiotic safe or a overdose?

Not effective. Polysporin (bacitracin and polymyxin) is a topical antibiotic. The infection is under your skin. If it is draining already then warm compresses several time/day should suffice. If it is spreading and or you develop fever or signs of a body wide infection you should seek help immediately. and antibiotics.