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Joseph C Pierson, MD Dermatology Residency Program Director, University of Vermont College of Medicine

Joseph C Pierson, MD is a member of the following medical societies: Association of Professors of Dermatology, New England Dermatological Society, American Academy of Dermatology

Disclosure: Nothing to disclose.

Christine C Tam, MD Managing Member, Certified Dermatologists

Christine C Tam, MD is a member of the following medical societies: American Academy of Dermatology

Disclosure: Nothing to disclose.

David F Butler, MD Former Section Chief of Dermatology, Central Texas Veterans Healthcare System; Professor of Dermatology, Texas A&M University College of Medicine; Founding Chair, Department of Dermatology, Scott and White Clinic

David F Butler, MD is a member of the following medical societies: Alpha Omega Alpha, American Academy of Dermatology, Association of Military Dermatologists, Phi Beta Kappa, Texas Dermatological Society

Disclosure: Nothing to disclose.

Edward F Chan, MD Clinical Assistant Professor, Department of Dermatology, University of Pennsylvania School of Medicine

Edward F Chan, MD is a member of the following medical societies: American Academy of Dermatology, American Society of Dermatopathology, Society for Investigative Dermatology

Disclosure: Nothing to disclose.

Dirk M Elston, MD Professor and Chairman, Department of Dermatology and Dermatologic Surgery, Medical University of South Carolina College of Medicine

Dirk M Elston, MD is a member of the following medical societies: American Academy of Dermatology

Disclosure: Nothing to disclose.

The authors and editors of Medscape Reference gratefully acknowledge the contributions of previous author, Diane Pierson, DO, to the development and writing of this article.

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