The skin is a living, dynamic organ that constantly interacts with its environment. Although skin ageing is partly determined by genetics, it is now clearly established that most visible skin changes are linked to external and internal factors. This is the context in which the exposome has emerged as a fundamental concept in dermatology and aesthetic medicine.
Understanding the skin exposome makes it possible to adopt a comprehensive, consistent and effective approach to preventing and managing skin ageing. In Geneva, where urban lifestyles expose the skin to multiple stressors, this approach is particularly relevant.
What is the exposome ?
The term exposome refers to all the exposures an individual experiences throughout life, whether environmental, behavioural or emotional. Introduced into science to complement the concept of the genome, it helps explain how the environment affects health.
Applied to the skin, the exposome encompasses all external and internal factors influencing its condition, ageing and capacity to regenerate. Unlike intrinsic ageing, which depends on age and genetics, exposome-related ageing is largely modifiable.
This concept is essential in aesthetic medicine. It moves beyond a purely corrective approach to incorporate comprehensive prevention based on understanding the causes.
The skin exposome
The skin exposome involves constant interaction between external stressors and internal factors specific to each individual. These two dimensions act cumulatively and often synergistically.
External factors include ultraviolet radiation, air pollution, climatic variations and artificial light. Internal factors include stress, sleep, diet and hormonal changes.
This interaction explains why two people of the same age can have very different skin quality.
External environmental stressors
External environmental stressors have a direct impact on the skin
Ultraviolet radiation : the leading cause of skin ageing
UV radiation is the leading cause of premature skin ageing. It is responsible for what is known as photoageing.
UV radiation causes significant oxidative stress, generating free radicals that break down collagen and elastin. It also contributes to pigmentation and loss of skin elasticity.
Chronic sun exposure, even at moderate levels, has a cumulative effect on the skin.
Pollution
Air pollution is now recognised as a key factor in skin ageing. Fine particles and pollutant gases penetrate or settle on the skin, causing oxidative stress and chronic inflammation.
It impairs the skin barrier, promotes dehydration and contributes to a dull complexion, pigmentation and wrinkles.
Blue light
Blue light, emitted by screens and certain light sources, is one of today's skin stressors. It penetrates deep into the skin and contributes to free radical formation.
Its role in skin ageing is still being studied, but current evidence suggests an impact on pigmentation and oxidative stress.
Climatic conditions
Climatic conditions directly affect skin quality. Cold and wind impair the skin barrier, leading to dryness and sensitivity.
Sudden temperature changes, common in winter, weaken the skin and disrupt its ability to adapt.
The internal exposome
Emotional and physiological factors play an important role in skin ageing and in aesthetic and functional changes to the skin.
Stress : an accelerator of skin ageing
Chronic stress directly affects the skin through cortisol production. It reduces collagen synthesis, impairs barrier function and promotes inflammation.
It also causes visible signs such as a dull complexion, dark circles, acne and skin sensitivity.
Sleep : a pillar of skin regeneration
The skin regenerates mainly at night. Insufficient or poor-quality sleep impairs repair mechanisms and accelerates skin ageing.
Lack of sleep produces a tired complexion, diminished radiance and more pronounced signs of ageing.
Diet
An unbalanced diet low in antioxidants promotes oxidative stress and inflammation.
Conversely, a diet rich in vitamins, minerals and essential fatty acids helps maintain healthy, resilient skin.
Biological mechanisms of the skin exposome
Exposome-related stressors act mainly through three mechanisms : oxidative stress, with free radical production ; chronic low-grade inflammation ; impairment of the skin barrier.
These mechanisms lead to gradual deterioration of dermal structures, reduced regenerative capacity and a decline in overall skin quality.
Effects of the exposome on the skin : clinical signs
The effects of the exposome appear as visible, often progressive signs :
- Development of wrinkles and fine lines.
- Loss of firmness and skin laxity.
- A dull, uneven complexion.
- Pigmentation spots.
- Skin dehydration.
- Increased sensitivity.
- Deterioration in skin quality.
These signs often occur together and progress over time without appropriate treatment.
Managing the exposome in aesthetic medicine
Managing the skin exposome requires a comprehensive approach combining prevention, dermocosmetic skincare and medical treatments.
The aim is to limit stressors, strengthen the skin's defences and correct existing changes.
Prevention is fundamental. It involves daily sun protection, topical antioxidants, appropriate cleansing, regular moisturising and a balanced lifestyle.
These measures help limit the impact of environmental stressors.
Aesthetic medicine techniques address the effects of the exposome.
Revitalising techniques, such as mesotherapy and Skinboosters, improve skin hydration and quality.
Peels stimulate cell renewal and even out the complexion.
Botulinum toxin and hyaluronic acid injections are used to treat certain types of wrinkles and perform medical facelift techniques.
Collagen stimulators help restore skin density and firmness.
Each treatment is tailored to the patient's profile and the stressors to which they are exposed.