With over 30+ years of providing medical care to patients, conducting research, and teaching, Dr. An Yen is a highly regarded dermatologist. Dr. Yen splits his time between teaching resident physicians, leading a charity for International Medical Education and practicing Dermatology. He retired from University of California Davis as a part-time staff member and Clinical Professor in 2018.

Clinical Interests

Dr. Yen’s clinical interests are focused on general and surgical dermatology including excisions, cosmetic reconstruction, and Mohs micrographic surgery.

Medical Education

  • Xuzhou Medical College (China)


  • Internal Medicine, Loyola University Chicago
  • Dermatology, University of California San Diego

Board Certifications

  • American Board of Dermatology

Professional Memberships

  • American Academy of Dermatology
  • American Society of Mohs Surgery

Charitable / Volunteer Activities

  • Volunteer Clinical Professor, University of California, Davis
  • Founder, International Dermatology Education Charitable Organization
  • Founding President, Honorary Chair, Board of Trustee, North American Chinese Dermatology Association