Our Doctors

Nothing compares to experience and expertise when it comes to med spa providers. Our Livermore, CA, medical professionals not only possess years of experience in aesthetic and family medicine, they also care deeply about providing individual attention and education to each person they have the pleasure of treating.

Whether you are visiting Silhouette for facial plastic surgery, medical spa treatments, or weight management guidance, you can trust our highly trained team to support you every step of the way.

Doctor Tam Nguyen

Dr. Tam Nguyen

Dr. Nguyen is nationally respected as a distinguished leader in nonsurgical cosmetic procedures. In addition to performing several thousands of injections and teaching dermatology and cosmetic procedures to doctors throughout the nation, Dr. Nguyen has been invited to lecture in different countries throughout the world.

He is on the faculty of the American Board of Aesthetic Medicine and the American Academy of Family Practice.

Committed to sharing and teaching his knowledge acquired through the years, Dr. Nguyen has led workshops throughout the country for the AAFP and ABAM, teaching hundreds of doctors his innovative new techniques and extending the reach of this nonsurgical approach within cosmetic medicine. He has many publications on dermatology and cosmetic procedures in leading journals, textbooks, and online sources.

Dr. Nguyen specializes in a nonsurgical facial rejuvenation treatment called the Silhouette Instalift. His work has been nationally published for different promotional campaigns.

One of Dr. Nguyen’s favorite aesthetic procedures is body contouring with fillers for a nonsurgical butt lift. He loves using Sculptra to restore and enhance natural beauty gradually over time.


Doctor Soraya Esteva

Dr. Soraya Esteva

Earning her Doctorate of Medicine and completing an internship and residency in Obstetrics and Gynecology from the University of Southern California, Keck School of Medicine, Dr. Esteva went on to become board certified in Obstetrics and Gynecology. She has worked in Northern California for the last six years.

Prior to medical school, she graduated from the University of California, Santa Cruz, where she majored in biochemistry and molecular biology.

As a provider of women’s health, she witnessed firsthand the difficulties many women have losing weight starting in adolescence and continuing after pregnancy and when they reach middle age. Many of her patients longed for a comprehensive and safe weight loss program. These experiences inspired her to pursue certification in weight loss management, including Dr. Emma’s hCG ketosis diet.

She is committed to providing both men and women the knowledge and emotional support to achieve lasting results!


Doctor Elyas Parsa

Dr. Elyas Parsa

Dr. Parsa is a board-certified family medicine doctor and program director in a medical residency program, where he specializes in teaching and supervising advanced procedures. He developed a strong interest in cosmetic medicine as a resident in Chicago, where he trained at a tertiary care center.  After joining Dr. Nguyen, Dr. Parsa further focused his natural gifts in cosmetic medicine, honing his skills in anti-aging techniques which utilize  BOTOX® , XEOMIN® and Dysport®  and variety of dermal fillers.

Dr. Parsa has a passion for consistently learning and his extensive experience in this field has led him to train with some of the best in this business. His broad knowledge base includes the use of laser technology to reverse sun damage as well as rejuvenate and build new collagen, or to remove unwanted tattoos or hair.  Most importantly, his holistic approach, focusing on the whole person, combines exercise, weight management, and nonsurgical techniques to make gradual changes leading to health, beauty, and longevity.

Outside of medicine, Dr. Parsa enjoys all that the outdoors has to offer including soccer, snowboarding, and fishing in more than 1,000 miles of the American Delta waterways in the valley. Dr. Parsa’s favorite procedure is lip fillers and he approaches each patient in an artistic way, combining the art of aesthetics with medicine.


Doctor Prem Tripathi

Dr. Prem Tripathi

Dr. Prem Tripathi is a fellowship-trained facial plastic and reconstructive surgeon practicing in the San Francisco Bay Area at Silhouette Med Spa. He has devoted his entire career to aesthetic and reconstructive surgery of the face and neck and prides himself on creating natural-looking results. He specializes in rhinoplasty, facelift, neck lift, eyelid surgery, lip lift, facial rejuvenation, and nonsurgical procedures.

Dr. Tripathi has trained at some of the most prestigious institutions in the country.  After college, he attended Keck School of Medicine of the University of Southern California, earning over 10 merit-based scholarships and being inducted into the Alpha Omega Alpha honor society, given only to the top 10% of medical students in the country. He went on to a competitive and rigorous 5-year training program in head and neck surgery, publishing peer-reviewed articles and book chapters, and being awarded first prize for his research in facial plastic surgery. He finished his training with an advanced fellowship in facial cosmetic surgery.

In his spare time, Dr. Tripathi enjoys cooking, hiking and spending time with his wife and daughters. 

Ready to schedule an appointment with one of our experienced providers? Please request a consultation online or call (925) 579-2510. We look forward to meeting with you!