• Dr.
    Sandra Leyo DuPont

    After taking much of 2019 off to spend time with her family, board-certified dermatologist Sandra Leyo DuPont, MD, is returning to Green Valley to provide comprehensive skin care at her own practice, Oasis Dermatology. She graduated with honors from University of Virginia School of Medicine in 1997. Having more than 23 years of diverse experiences, including family medicine, United States Navy Medical officer, and dermatology, Dr. Sandra Leyo DuPont offers compassionate and thorough medical care for all ages. She strives to deliver the highest quality of healthcare to all of her patients.

    Medical School

    • University of Virginia School of Medicine- 1997
    • Residency
    • Banner Good Samaritan- Family Medicine-2000
    • University of Arizona- Dermatology- 2012

    Patients' Choice Award (2017)


    Patients' Choice recognition reflects the difference a particular physician has made in the lives of his/her patients. The honor is bestowed to physicians who have received near perfect scores, as voted by patients.


    Accepting Medicare and most major insurance plans.

  • Patricia Ferrer
    Physician Assistant

    Patricia Ferrer is a certified physician assistant specializing in dermatology for more than twenty years. She provides medical and surgical dermatologic services with emphasis on prevention and early detection of skin cancer and management of chronic dermatologic conditions. Ms. Ferrer has a compassionate nature and provides thorough and quality dermatology care to all her patients.

    In her spare time, she volunteers her dermatology services to Tucson’s low-income uninsured and travels to Central America for medical humanitarian aid missions. 

    Medical Education:

    University of Texas Medical Branch - Bachelor of Science PA Studies 1998

    University of Nebraska - Master of Physician Assistant Studies with specialization in dermatology 2005

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