I have this bump and it's getting increasingly more bothersome. I noticed it about a week and a half/two weeks ago. it's about the size of a nickel. I accidentally popped it a week ago and a lot of puss and blood came out. Then today, I hit it on the dishwasher and it burst again, but this time it was just blood. It noticed that only one side is bleeding and the other is a purplish color. What is this? Should I be worried?