Office staff is AMAZING and probably the most professional out of all the medical offices I have ever been to! Their passion for patient care and willingness to help others is top notch. They are very accommodating to my busy schedule and are always running on time for my appointments. Great establishment all around, I highly recommend Foothill Dermatology!!!

The Physicians

Amarpaul Sidhu
M.D., M.P.H., F.A.A.D., F.A.S.D.S.

Dr. Amarpaul Sidhu is the Medical Director and founder of Foothill Dermatology Medical Center. He runs two practices, one in Glendora and one in Rancho Cucamonga. He is a Board Certified Dermasurgeon with a background in dermatologic surgery and general surgery, and he has specialized in skin cancer and cosmetic treatments.Dr.Sidhu has carried out over 25,000 skin cancer surgeries to date since he first opened his practice. He is a native of the Seattle Washington area and has earned degrees in psychology at the University of Washington, Doctor of Medicine degree at Tulane University in New Orleans, and went on to pursue a General Surgery degree at Virginia Mason Medical Center. He has extensive training and expertise in MOHS micrographic surgery, cosmetic surgery, and plastic surgery. Dr. Sidhu's Credentials and Certifications are as follows:

  • Certified by the American Board of Dermatology
  • Fellow, American Society for Dermatological Surgery
  • Member, American Medical Association
  • Fellow, American Academy of Dermatology

Dr. Sidhu's Hospital Privileges:

  • Foothill Presbyterian Hospital
  • Intercommunity Hospital
  • San Dimas Community Hospital

Keshea Stevenson, MHS, PA-C


This enthusiastic, motivated, and patient-centered provider received her Bachelors of Science in Public Health from California State University, Northridge. She worked as a public health educator and high school science teacher for several years before relocating to Philadelphia, Pa and attending one of the most prestigious physician assistant programs in the United States, MCP Hahnemann / Drexel University. She graduated with honors at the top of her class.
Keshea, affectionately referred to as Key, has spent the bulk of her career living her dreams and specializing in the fields of dermatology ans aesthetic medicine. Throughout her 11 years of experience, her love and adoration of the field shines through every patient encounter. Her strong sense of patient wellbeing ensures her patients that they are in knowledgeable and trust worthy hands. She has an electric personality that is caring and overall FUN! She is passionate about her carft and attends regular training on the most up to date treatments available in the USA and worldwide.

Melissa Bustos, MSPAS

Melissa Bustos MSPAS was born and raised in Southern California. She received her Bachelor of Science in Biology from the University of La Verne, and her Masters of Science in Physician Assistant Studies at Western University of Health Sciences in Pomona, California. She has years of experience in Family Medicine, Urgent Care, and Dermatology. When she is not working, she enjoys hiking the hills of Claremont and exercising. She is passionate about skin care, and does all she can to help others maintain skin health and promotes skin cancer prevention.

America Quintana M.S. PA

America Quintana M.S. PA-C aka "Miss America" has been a PA servicing Los Angeles and San Bernardino County for over ten years. She is easy going, quirky, and an energetic addition to our team. Miss America has a Bachelors degree in Kinesiology from Cal Poly Pomona. She received a Masters in Gerontology from the University of La Verne. She is a proud alum of Charles R Drew University Physician Assistant Program.

Miss America began her career as a Family and Emergency Medicine Physician Assistant, and quickly found her passion for Medical and Cosmetic Dermatology.

When Miss America isn't working, She enjoys traveling the world with her husband. Her favorite city in the world is Paris, and she loves the white sandy beaches of Aruba. She is an avid Pilates and Spin enthusiast. You might hear her speak about the benefits of essential oils around the office. When she comes home, she is greeted by her two dogs, Penelope and Sophie, a rabbit named Gucci, and her 24 year old tortoise named Baby.

Denise Matthews, Esthetician

Working closely with Dr. Sidhu for over ten years at Foothill Dermatology has been the highlight of her career. Dr. Sidhu’s vast knowledge and expertise has given Denise the confidence and skills to effectively improve the quality of not only her patients’ skin but their own confidence as well. Ongoing education is a priority so you will always have the latest proven technology and treatments available. Denise feels Foothill Dermatology is the premier facility in which to be seen for not only medical needs but also cosmetic procedures ensuring her ongoing loyalty to the practice.

Andrea Casillas, Practice Manager.

Andrea attained her Bachelors of Health Administration from the California State University of San Bernardino. Andrea who joined Foothill Dermatology in 2018 says she has never worked with such a wonderful and committed team before. She claims everyone at Foothill Dermatology truly loves what they do. Andrea is eager to see how Foothill Dermatology will continue to flourish and is very excited to be a part of the team.

Monica Navarro, Office Manager

Monica grew up in Glendora CA and is the eldest of four children. She has two very mischievous dogs named “Oreo” and “Ivory” and enjoys hiking, reading, playing the clarinet, attending church and spending time with family and friends.

Monica began working in the field of Dermatology in her senior year of High School and soon learned many aspects of the specialty that she has been able to apply to her daily life.

“I was fortunate enough to understand how important the skin is at a young age. After seeing how prominent skin cancer is, I was the one telling my friends and family not to tan and to use sunscreens. I know it’s difficult living in sunny California but I feel the skin is something we all kind of leave for last- once the damage is done.”

Along with Jessica and Denise, Monica was a founding member of the Foothill Dermatology Medical Center and has been with Dr. Sidhu since day one. 

"It has been a difficult yet rewarding experience. I think one of the best things, is being able to see the healing process take place in the different patient cases we see. Although I am not the one treating the patient, it is always wonderful to see the improvement people make. And there is nothing better than to get to know the individuals that walk through the door on a personal level. Hearing their fun family stories, seeing pictures from their trips, and being able to be a listening ear and shoulder during the bad times as well – which can go both ways.”

Contact Us

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Our Locations

Hours of Operation

closed everyday for lunch from 1pm to 2pm

Foothill Dermatology Medical Center


9:00 AM-6:00 PM


9:00 AM-6:00 PM


9:00 AM-6:00 PM


9:00 AM-6:00 PM


9:00 AM-6:00 PM