About Our Skin Specialists

Located in Scottsdale, AZ, The Blume Skin Centre was formerly Parkway Medical Laser & Skin Centre.

Martin Blume, DO, MBA

Dr. Martin Blume has been in practice since 1980. He is a graduate of Philadelphia College of Osteopathic Medicine and Arizona State University where he received a Masters Degree in Business Administration and is Board Certified. Dr. Blume is in a unique position to perform aesthetic procedures as he participated in a surgical residency in both Philadelphia, PA, and Phoenix, AZ. His overall knowledge and surgical skills have given him the ability to produce excellent results with realistic expectations. With his extensive experience in cosmetic injections, Dr. Blume has instructed at all levels of injection techniques for over a decade. He is an approved instructor for Allergan, makers of Juvederm and Botox, and is available for private instruction throughout the Southwest.
Dr. Blume previously managed Parkway Medical Urgent & Family Care and Parkway Medical Laser & Skin Centre in Scottsdale, AZ. He is certified in Family Practice, Managed Care, and Quality Improvement/Utilization Management.

Sandra Caldwell, Clinic Manager

bust_sandraCertified Supervising Laser Technician, Licensed Medical Aesthetician, Certified Advanced Ultherapist

Sandra has over twenty years of experience in Medical Aesthetics, Laser Treatments, Customer Service, and Retail Operations. As the Clinical Manager, she is committed to exceeding patient expectations and giving outstanding personal service. Sandra is the Laser Safety Officer at The Blume Skin Centre and is a Certified Laser Instructor with advanced certification in: Laser Technology, CoolSculpting, Ultherapy, Venus Legacy, Venus Viva, Pollagen Legend Voluderm, CO2 Pixel and BBL/IPL Photofacial. Sandra also has a Bachelor of Science Degree in Business Administration from San Jose State University. In her free time, Sandra loves to travel with her husband and dogs (a lab and two beagles) and spending time with and her granddaughters Abigail and Isabel.

Caitlin Sixbey, Senior Licensed Medical Aesthetician

Caitlin Sixbey medical aesthetician scottsdale arizonaCertified Laser Technician, Certified Advanced Ultherapist

Caitlin has been a certified Medical Aesthetician and Laser Technician for nine years. She has been with The Blume Skin Centre for three years. The Blume Skin Centre patients rely on Caitlin to provide medical grade facials and customizing their skin care routine. Caitlin has received advanced training and certification in the following: Ultherapy, Venus Legacy, Sciton BBL, Photofacials, Pollagen Legend +, Venus Viva, Radio Frequency Skin Tightening, Radio Frequency Resurfacing, Radio Frequency Microneedling, Certified Phlebotomist. Caitlin is an expert in: Chemical Peels, Dermasweep, Plasma Rich Protein (PRP), Microneedling, and Customized Airbrush Spray Tanning. Caitlin is originally from Rochester NY, in her free time, Caitlin likes to watch movies, take new fitness classes and spend time with her family and kitties.

Jennifer Fontius, MD

Jennifer Fontius, MD

Jennifer Fontius, MD grew up in the San Francisco Bay Area, obtained her bachelor’s degree in Physiological Sciences at UCLA and her medical degree at USC. She completed her residency in Family Medicine at UCLA and has worked in a variety of clinic since then. Dr. Fontius opened her current solo medical practice in North Scottsdale in 2011.
In addition to her medical practice, Dr. Fontius is the medical supervisor for a medical weight loss clinic and participates in Quality/Utilization activities for healthplans. She has been practicing aesthetics for eight years, having been trained and mentored by Dr. Blume. Dr. Fontius, is a clinical preceptor for the University Of Arizona College Of Medicine.
In her spare time, Dr. Fontius enjoys running, tennis, and travelling.


Barbara Passaretti RN BSN, Aesthetic Nurse Injector

Barbara Passaretti RN BSN

Barbara joins The Blume Skin Centre with over thirty years nursing experience with advanced training and certification in dermal fillers, neurotoxins and skin rejuvenation. Barbara’s philosophy in medical esthetics is a results-driven approach individualized for each patient’s priorities and needs. She has excellent rapport with her patients and is highly skilled in injectable procedures including: Botox, Dysport, Restylane, Restylane Lyft, Juvederm, Juvederm Voluma, Radiesse and Sulptra. Barbara continues to attend education and training to stay abreast of the latest technologies and procedures.

Everyone’s skin is different! Find the treatment that is right for you.