Unless it's bleeding and looking infected, I wouldn't worry too much. I've never heard of something like that causing cancer, but believe me, you'd know it if it did turn. Keep an eye on it, and if it starts getting bigger, or bleeding and itching alot, changes color or just starts looking 'funny', then yes, you should go get it looked at. But if it looks ok right now, there isn't a thing your doctor can do unless there's a problem with it. He can't look at it and say Yep, it's gonna turn to cancer. So please, don't worry about it unless it's not healing, and put away those damn scissors.