Today, taking care of your skin is no longer just about correcting visible signs of aging. Skin longevity has now naturally become part of the cosmetic approach., aiming to support, day after day, the biological mechanisms of our skin to preserve its balance and slow down aging processes.

In this article, we shed light on a subtle yet crucial mechanism of skin aging.

Every spot, darker area, or dull complexion does not appear by chance. These are often the visible manifestations of an invisible phenomenon: the accumulation of oxidative stress in skin cells. Over time, this buildup disrupts several essential mechanisms involved in pigmentation:

• •On one hand, it can stimulate irregular melanin production, the pigment naturally produced by the skin to protect itself, especially against external aggressors such as UV rays.
• •On the other hand, it promotes the formation of lipofuscin, a yellow-brown pigment resulting from the accumulation of oxidized cellular waste, often called the “age pigment.” (2).

This biological process is universal: it affects all skin types. Initially silent, it gradually becomes visible with age, regardless of skin tone or type

In response to this, a new approach to skin aging is emerging in cosmetics: melano-aging.

It is based on the idea that pigmentary irregularities and signs of aging are not two separate phenomena but different manifestations of the same biological process. This approach allows for the simultaneous treatment of pigmentation and aging, rather than offering separate anti-spot and anti-aging products.

Beyond melano-aging, which focuses on melanin by name, there is another pigment related to aging: lipofuscin.

This pigment has only recently gained attention, and for good reason: it is silent. Initially invisible, without immediate symptoms, it nonetheless establishes itself in the skin over time.

But that’s not all. Lipofuscin is:

• • Cumulative,
• • Irreversible,
• •And above all, pro-oxidant.

Its accumulation is not solely due to oxidative stress. It is also closely linked to the decline of a fundamental cellular mechanism: autophagy (2).

Autophagy is the natural recycling process of damaged cellular structures and molecules. The term comes from the Greek auto (“self”) and phagein (“to eat”): the cell digests its own waste to regenerate and maintain balance.

With age, this natural cellular cleaning system slows down, allowing lipofuscin to accumulate and create a vicious cycle that accelerates skin aging.

The Vicious Cycle of Lipofuscin

Lipofuscin does not just accumulate—it becomes a source of imbalance. Being pro-oxidant, it generates reactive oxygen species (ROS), locally recreating oxidative stress. This explains why an aging cell can transmit its state to neighboring cells.

These ROS also activate melanogenesis (3) ) stimulating melanin production, which leads to visible spots.

Gradually, lipofuscin and melanin aggregate, forming pigment clusters that become increasingly difficult to degrade.

Thus, a true vicious cycle is established, contributing to an increase in pigmentary age.

Understanding these mechanisms now paves the way for a new generation of skincare capable of acting upstream of pigmentary aging, preserving the radiance and evenness of the complexion over the long term.

At CODIF,these mechanisms are central to our research, guiding a fresh approach to pigmentary aging.

Sources:

1. Skoczynska A, Budzisz E, Trznadel-Grodzka E, Rotsztejn H. (2017) Melanin and lipofuscin as hallmarks of skin aging. Postepy Dermatol Alergol. Apr;34(2):97-103. doi: 10.5114/ada.2017.67070
2. Rinnerthaler, M., Bischof, J., Streubel, M. K., Trost, A., & Richter, K. (2015). Oxidative Stress in Aging Human Skin. Biomolecules, 5(2), 545-589. https://doi.org/10.3390/biom5020545
3. Paulo Newton Tonolli, Mauricio S. Baptista, Orlando Chiarelli-Neto, (2021) Melanin, lipofuscin and the effects of visible light in the skin, Journal of Photochemistry and Photobiology, https://doi.org/10.1016/j.jpap.2021.100044