Acknowledgements

 
We acknowledge with great pleasure and profound gratitude the contributions of Suzanna Perez, Lorenzo Cerroni, Walter Urbanek, and David Spencer, all of whom contributed generously material that was crucial to our endeavor.
 
Dr. Böer is a resident in dermatology at the University of Frankfurt. Dr. Guo is an Associate at the Ackerman Academy of Dermatopathology in New York City, where Dr. Ackerman is director.