I broke my toe nail at Berlin airport by my heavy bag. Even though my toe nail is dead and looks ugly, and I still can't walk normally, I am much better now, no more pain. I just need to wait until the new nail grow out.
Thanks for the help of Andrew, Elizabeth, Noelle and Janelle. And the doctor at the airport is very nice. He is kind and skilled. If you get hurt at Tegel airport, you can go to first-aid room of the airport which is on the -1 floor.