I've been told that some derms don't perform this procedure. The one I go to does and she automatically injects cortisone so it's never something that I have to ask for. If it would make you feel better, I would agree that you should call ahead of time to make sure they'll do this. As for how much it costs, I think it might all be different but for me, I just pay my $5 insurance co-pay and that's it. Good luck! I hope everything works out well for you!