I'm always nervous when I do it, and I am even more nervous when I advise someone to do this. When I do it I make a tiny hole in the center of the bruise then very carefully start removing small pieces of the shell until I find the bill. Most bill bruises are round, so I think there is the possibility that this bruise could be from something else.Thank you for the advice! What do you usually use when you do this? Can you tell me your technique? I'm so nervous!!