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Kara N Shah, MD, PhD Associate Professor, Departments of Pediatrics and Dermatology, University of Cincinnati College of Medicine

Kara N Shah, MD, PhD is a member of the following medical societies: American Academy of Dermatology, American Academy of Pediatrics, Society for Pediatric Dermatology

Disclosure: Serve(d) as a director, officer, partner, employee, advisor, consultant or trustee for: Abbvie; Pfizer.

Michael J Wells, MD, FAAD Dermatologic/Mohs Surgeon, The Surgery Center at Plano Dermatology

Michael J Wells, MD, FAAD is a member of the following medical societies: Alpha Omega Alpha, American Academy of Dermatology, American Medical Association, Texas Medical Association

Disclosure: Nothing to disclose.

Van Perry, MD Assistant Professor, Department of Medicine, Division of Dermatology, University of Texas School of Medicine at San Antonio

Van Perry, MD is a member of the following medical societies: American Academy of 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.

Jean Paul Ortonne, MD Chair, Department of Dermatology, Professor, Hospital L'Archet, Nice University, France

Jean Paul Ortonne, 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 Chief Editor, William D. James, MD, and previous author, Carola Duran-McKinster, MD, to the development and writing of this article.

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