The William Foley Journal · Mind–Body–Skin
The Brain–Skin Axis
We talk about the gut–skin axis. But what about the brain–skin axis?
By William Foley
For years, the beauty and wellness industries have talked about the gut–skin axis. Look after the gut. Support the microbiome. Eat well. Reduce ultra-processed foods. Consider what is happening internally rather than simply treating what we see externally.
I agree with much of that. But I think there is another conversation we need to be having: the brain–skin axis.
After 17 years of working closely with people’s skin, I’ve become increasingly interested in something that can’t always be explained by a product, ingredient or treatment — the person attached to the skin. Their stress, their sleep, their emotional state, their environment, the pace at which they’re living and, importantly, their nervous system.
Your skin doesn’t exist in isolation
The skin isn’t simply a covering that sits on the outside of us. It is a living, sensory and neuroimmune organ, interacting continuously with the nervous, endocrine and immune systems. When we experience psychological stress, the body doesn’t neatly contain that experience inside the brain. Signals travel throughout the body.
Stress-related pathways involving hormones such as cortisol, alongside neuropeptides and inflammatory signalling, can influence processes within the skin, including barrier recovery, immune activity, inflammation and sebaceous function. It helps us understand something practitioners have observed for generations: periods of stress can show up on the skin.
Acne can flare, eczema can become more reactive, psoriasis can worsen and rosacea can become more difficult to settle. Skin can feel itchy, sensitive or uncomfortable, and healing can sometimes appear slower. Stress isn’t the sole cause of these conditions — skin health is complex and individual — but the nervous system can be one part of that much bigger biological picture.
Perhaps one of the most fascinating aspects of the brain–skin axis is that communication isn’t simply brain to skin. It’s bidirectional. The skin contains an extraordinary network of sensory nerves, immune cells and chemical messengers continually communicating information back into the body.
When somebody is experiencing a visible, painful or uncomfortable skin condition, that can affect their emotional wellbeing too. So we can sometimes find ourselves in a loop: stress influences the skin, the skin becomes distressed, this creates further psychological stress, and the cycle continues. This is why I believe treating skin only from the outside can sometimes miss part of the story.
We were taught to look at the whole person
This conversation is particularly interesting to me because of my original training in beauty and holistic therapies. Long before terms such as biohacking, nervous system regulation and the brain–skin axis became part of the mainstream wellness conversation, we were taught something incredibly important: don’t just look at the symptom. Look at the person.
We learned about stress and the nervous system, the importance of touch and relaxation, and we considered sleep, lifestyle, nutrition, circulation, hormones and emotional wellbeing. Most importantly, we were taught to think about the person as a whole rather than treating individual systems as though they existed independently.
That education has never left me. Seventeen years later, despite working with advanced aesthetics and modern technologies, I increasingly find myself returning to those foundations. But now we’re beginning to understand more about the biology behind some of those connections.
Science is exploring communication between the brain, nervous system, immune system and skin. Psychodermatology examines the relationship between psychological wellbeing and dermatological disease, while researchers continue to investigate how stress signalling can affect inflammation and skin-barrier function.
That doesn’t mean every traditional holistic concept has suddenly been scientifically proven, and we should be careful about making that leap. But it does reinforce something fundamental that holistic practitioners have long been encouraged to consider: you cannot completely separate the skin from the person living inside it.
Why I ask my clients how they are
When somebody comes into my clinic, I’m interested in their skin, but I’m equally interested in the human being sitting in front of me. How are they sleeping? How stressed do they feel? Are they constantly rushing? Have they been through a difficult period? How are they nourishing themselves? Are they getting outside? When did they last properly rest?
I’m not asking these questions to diagnose someone’s psychological health. I’m an aesthetic and holistic practitioner, not a doctor or psychologist. I’m asking because they help me understand the environment in which that person’s skin is currently trying to function. Biology doesn’t happen in isolation.
Modern aesthetics has become exceptionally good at doing things to skin. We peel it, needle it, heat it, resurface it and stimulate it. There is absolutely a place for advanced treatments — I use them myself — but I increasingly believe that knowing when not to stimulate the skin is just as important as knowing how to stimulate it.
Sometimes the most intelligent thing we can do is create the conditions in which the body can do what it already knows how to do. Support the skin barrier, improve hydration, prioritise sleep, move the body, eat nourishing whole foods, spend time outside, experience natural light, reduce unnecessary stimulation, create moments of stillness and allow biology some space to function.
Old wisdom. Modern understanding.
Perhaps progress isn’t always about abandoning old knowledge for something new. Sometimes progress comes from revisiting what we’ve learned through generations of caring for the whole person and allowing modern science to help us understand the mechanisms behind some of those observations.
This is the space that fascinates me: holistic wisdom meeting modern biology. Not rejecting technology. Not rejecting medicine. Not claiming that every skin condition can be solved by reducing stress or spending more time in nature. But recognising that human beings are interconnected biological systems.
The gut matters. Nutrition matters. The microbiome matters. But so do the brain, nervous system, sleep, stress, movement, light, touch, relationships and our environment.
This is where BioSync comes in
This thinking sits at the heart of my BioSync Method®. Rather than asking only, “What treatment does this skin need?”, I want us to start asking, “What environment does this human need in order for their skin to function well?”
That one question changes the conversation.
Perhaps the future of skin health isn’t about finding another isolated part of the body to treat. Perhaps it’s about remembering that none of these systems were isolated in the first place.
For me, the future of aesthetics isn’t simply about creating younger-looking faces. It’s about helping create healthier humans.
And maybe, after years of concentrating on what we’re putting onto the skin — and more recently what is happening within the gut — it’s time we paid a little more attention to what’s happening in the brain and nervous system too.
Because the skin is part of the human being.
And sometimes the skin isn’t the problem. Sometimes it’s the messenger.
William Foley
Founder, William Foley Skin
Creator of The BioSync Method®