Reflections on Curiosity, Collagen, and the Evolution of Regenerative Medicine
By Ellen S. Marmur, MD
Medicine occasionally advances through dramatic discoveries, but more often it progresses quietly through careful observation, persistence, and the willingness to ask questions that seem almost too simple.
More than twenty years ago, during my fellowship with Dr. David Goldberg, we began studying calcium hydroxylapatite (CaHA), now widely recognized as Radiesse®. At the time, it was regarded as a promising soft-tissue filler. Like others in the field, we expected it to restore volume. What interested us was a different possibility: might it also change the biology of the tissue into which it was placed?
That question became the foundation of much of my early academic career.
Our investigation began not in the treatment room, but in the dermatopathology laboratory. We wanted to understand what happened after the syringe was put away – how human skin responded over time, not simply in appearance, but at the microscopic level.
Maternity Leave Memories
One of my clearest memories from that period comes from maternity leave.
Our son was only a few weeks old. I would bring him with me to the dermatopathology department, asleep in a BabyBjörn carrier against my chest, while I spent hours examining electron micrographs. There was no sophisticated image-analysis software. I counted collagen and elastin fibers manually, using a magnifying loupe and a ruler, moving patiently from one image to the next.
At the time, it felt like painstaking bench work. I certainly was not imagining that those measurements might eventually contribute to an entirely new way of thinking about injectable treatments. Looking back, however, those quiet hours in the laboratory represent one of the most formative experiences of my professional life. They taught me that meaningful scientific advances are often built from meticulous observations that seem unremarkable until viewed through the lens of time.
Scientific Progress Begins with Observation
In 2004, our team published one of the earliest human histologic and electron microscopic studies demonstrating that calcium hydroxylapatite did more than occupy space. The tissue surrounding the microspheres showed evidence of new collagen formation, suggesting that the material functioned not simply as a filler, but as a stimulus for tissue remodeling. Years later, the aesthetic community would adopt the term biostimulation to describe this phenomenon. At the time, we simply described what we observed.
That distinction remains important to me. Scientific progress begins with observation. Terminology evolves later.
The questions that followed were natural extensions of those first findings. If calcium hydroxylapatite could stimulate collagen formation, how might that biology be applied more thoughtfully in clinical practice? Could it restore structural support in areas beyond the traditional nasolabial fold? Could treatments be made more comfortable without compromising safety? Would the same favorable tissue response be seen in patients with skin of color? Could the biology that we observed in the microscope translate into durable improvements in aging hands, temples, and jawlines?
Clinical Investigations
Over the following years, my colleagues and I pursued these questions through a series of clinical investigations. Our early pilot study of hand rejuvenation explored one of the first applications of CaHA beyond facial folds, an indication that would later receive FDA approval. We later published one of the earliest randomized studies demonstrating that premixing CaHA with lidocaine substantially reduced procedural discomfort while maintaining safety and clinical effectiveness, work that would eventually lead to FDA approval of a premixed formulation. Additional work established the safety of CaHA in patients with skin of color, showing no clinically significant increase in post-inflammatory hyperpigmentation. Prospective pilot studies of the temples and jawline helped demonstrate that CaHA could restore facial architecture in ways that anticipated today’s emphasis on structural rejuvenation rather than isolated wrinkle correction – work that, for the jawline, would also eventually lead to its own FDA approval.
Viewed individually, these studies addressed practical clinical questions. Considered together, they reflected a broader shift in thinking. Rather than asking how best to replace lost volume, we began asking how to encourage the skin to repair and strengthen itself.
That philosophy has since become the foundation of regenerative aesthetics.
The Same Biological Curiosity
The same throughline ran through the studies that followed in other materials. As an investigator on Phase II and FDA trials of hyaluronic acid fillers for the lips and hands, I kept returning to the same underlying question I had first asked in the dermatopathology lab: not simply how much volume a material could restore, but how the surrounding tissue responded to its presence over time. Different chemistries, different anatomic sites, the same biological curiosity.
That curiosity eventually carried me beyond injectables altogether. Across my years leading surgical and cosmetic dermatology at Mount Sinai, and in the private practice that followed, I became increasingly interested in a related question: if a foreign material could prompt the skin to remodel itself, could light do the same, without ever breaking the skin barrier? Photobiomodulation became the next chapter of that inquiry. Skin is the only organ built to respond directly to light, and different wavelengths speak to it differently – green and pulsed light to calm and balance, red to support mitochondrial repair, blue to target bacteria, amber and purple to soothe and reinforce the barrier. That research became the foundation of the patented MMSkincare system I call Photodynamic Beauty, pairing each wavelength with formulations designed to work with light rather than around it.
There is something fitting in that progression. The collagen fibers I once counted by hand under a microscope were responding to a material placed beneath the skin; the photons activating skin cells today began their journey, quite literally, in the sun. Light is one of the few forces that connects biology across every scale, from a single fibroblast to the largest structures in the universe. Studying how it interacts with human tissue feels like a small, grounded way of participating in something far larger than any one treatment or any one patient.
Regenerative Medicine Today and Tomorrow
Today, the conversation extends well beyond fillers. Regenerative medicine now encompasses energy-based technologies, biologics, adipose-derived therapies, precision skin care, genomics, and artificial intelligence. The boundaries between aesthetic medicine, dermatology, longevity science, and preventive health continue to dissolve. Increasingly, we are learning to measure the biological age of tissues, characterize their regenerative capacity, and intervene before structural decline becomes clinically apparent.
I believe this convergence represents the future of our specialty. The aesthetic physician of tomorrow will not simply restore youthful contours. They will integrate imaging, biomarkers, genetics, and regenerative therapies into individualized strategies designed to preserve tissue health over decades. Appearance will become one expression of underlying biological resilience rather than an isolated cosmetic endpoint.
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Looking Back on Her Scientific Journey
When I look back over this work, I think less about individual publications than about the continuity of the questions themselves. Scientific careers are rarely defined by a single discovery. They are shaped by a willingness to follow an idea wherever it leads.
For me, that journey began with a microscope, a magnifying loupe, and a sleeping infant against my chest while I counted collagen fibers one by one. It continues today in the evolving fields of regenerative aesthetics and longevity medicine, where many of the questions remain remarkably similar to those we asked more than two decades ago.
Medicine changes. Technology advances. Yet the essential work of science – careful observation, intellectual curiosity, and respect for the biology of our patients – remains timeless.
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