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Alexa earned her undergraduate degree from UC Berkeley and completed her Master of Science in Nursing at Vanderbilt University. Alexa has over 5 years of experience as a dermatology medical assistant, gaining a strong foundation in skin pathology, dermatologic procedures, and patient-centered care. After passing her AANP board certification in 2025, she joined Zand Dermatology.

Alexa completed a comprehensive dermatology residency under the mentorship of Dr. Sarv Zand and Dr. Paula Zand, with focused training in skin cancer detection, acne and rosacea management, eczema and psoriasis care, and the use of lasers and energy-based devices. Patients consistently describe Alexa as warm, thorough, and an excellent communicator—someone who makes complex information clear, accessible, and reassuring.

Medical Dermatology

• Full skin examinations and skin cancer screenings

• Treatment of acne, rosacea, eczema, psoriasis, hair loss, and more

Procedural Dermatology

• Biopsies, cryotherapy, and electrodessication & curettage

Cosmetic Dermatology

• BBL™, Ultherapy®, and Microneedling for collagen stimulation and rejuvenation

Outside the clinic, Alexa enjoys exploring San Francisco with her husband, cooking, playing soccer, and spending time with her close-knit family and friends.

We are thrilled to have Alexa at our practice and know that you will love her thoughtful, gentle, education-forward approach to care.

The Longevity Collective is where wellness meets innovation, empowering adults across Marin County to live vibrantly and age with confidence. Nestled in the heart of Fairfax, California, our practice isn’t just a clinic—it supports your lifestyle. Each treatment is here to revive, destress and reenergize your body and mind.

We have state-of-the-art treatments grounded in science yet driven by our belief that age is just a number. The Longevity Collective team offers a dynamic suite of services: red light therapy, acoustic soundwave therapy, cranial therapy, peptide therapy, concierge medicine and pulsed electromagnetic field (PEMF) therapy. With the effectiveness of our cold plunge tubs followed by an infrared sauna, every visit is an experience of self-renewal tailored to your wellness needs. 

Sessions here aren’t just an appointment. We offer new anti-aging and wellness experiences and we won't rush you out. We want to support your wellness goals. Our team will listen to your needs and recommend a plan that is right for you. Whether it’s alleviating pain, restoring energy, rejuvinating your skin, or talking with Dr. David Baldini, every recommendation is designed with one goal: to unlock the energy and vitality of every person who walks through our doors.

Start your journey with The Longevity Collective today—where each of our unique treatments brings you closer to your health goals. Call the office or request a consultation online today. 

Dr. Melissa Loja, MD, MAS, FACS, FSVS, RPVI, completed medical school at the University of California at Davis. She went on to be among the first in the nation to complete a specialized integrated vascular surgery residency program at the University of California at Davis. Dr. Loja was selected for the highly competitive NIH funded T32 research grant, which led to widely cited publications. She attained a Master's degree in Clinical and Translational research from these efforts. In addition, she holds a Bachelor's degree in Biologic Sciences, also obtained at the University of California at Davis. Dr. Loja specializes in vascular and endovascular surgery, including carotid artery disease, aneurysm repair, dialysis access, treatment of mesenteric and renal artery disease and lower extremity revascularization. Among her clinical interests, limb salvage and peripheral arterial disease with a multidisciplinary focus is a particular passion of hers. She is expertly trained and highly skilled in endovascular as well as surgical management of peripheral arterial disease.