I pierced my nose in Feb. It got infected really bad. After applying some topical cream it reduced. But a small black bump was left next to the piercing. I thought it's a scar from the infection and started applying mederma. But a few days back I came to know it must be either hypertropic scarring or a keloid. I did sea salt soak for 2 days morning and evening and the third day I applied tea tree oil after sea salt soaking. When I woke up the next day the bump had turned still more black. I don't know whether its common or not. Am using hollywood tea tree oil which is actually diluted. And my nose stud is 18K gold with diamond.