John Montgomery Yost, MD, MPH is a Clinical Associate Professor in Dermatology at Stanford Health Care and the Director of the Nail Disorders Clinic. After attending medical school at the University of Michigan, he completed his residency at the Ronald O. Perelman Department of Dermatology at New York University Langone Medical Center. His clinical and research interests include nail disorders, tumors of the nail apparatus, nail surgery, longitudinal melanonychia, brittle nail disease, and inflammatory nail disorders.

Clinical Focus

  • Dermatology
  • Nail Disorders
  • Nail Surgery
  • Longitudinal Melanonychia
  • Tumors of the Nail Apparatus

Academic Appointments

Honors & Awards

  • Fulbright Scholar - Hamburg, Germany, United States Department of State, Bureau of Educational and Cultural Affairs
  • National Medical Honor Society, Alpha Omega Alpha (2009-Present)
  • Morris Leider Award for Excellence in Dermatology, New York University Langone Medical Center The Ronald O. Perelman Department of Dermatology (2014)

Boards, Advisory Committees, Professional Organizations

  • Member, Council for Nail Disorders (2013 - Present)

Professional Education

  • Board Certification: Dermatology, American Board of Dermatology (2014)
  • Residency:New York University Medical CenterNY
  • Medical Education:University of Michigan Medical School (2010) MI
  • Internship:Oakwood Hospital and Medical CenterMI
  • Masters in Public Health, Boston University School of Public Health, Epidemiology
  • BA, Bowdoin College, Cum Laude


All Publications

  • A case and review of congenital leukonychia. Dermatology online journal Pathipati, A. S., Ko, J. M., Yost, J. M. 2016; 22 (10)


    Leukonychia refers to a white discoloration of the nails. Although several conditions may cause white nails, a rare, isolated, congenital form of the disease is hypothesized to stem from disordered keratinization of the nail plate. Herein, we report a case of a 41-year-old woman with congenital leukonychia and review prior cases.

    View details for PubMedID 28329587