Seborrheic Dermatitis and Hormones: The Hidden Role of Metabolic Signalling
Seborrheic dermatitis is often described as a condition of oily, flaky or irritated skin.
But there is another layer to the story that receives far less attention: hormonal and metabolic signalling.
Our hormones influence countless processes in the skin, including sebum production, cell turnover, inflammation and the way the skin responds to its surrounding environment.
This is one reason seborrheic dermatitis may be more complicated than simply having an oily scalp or face.
Sebum is only one part of the equation
Sebaceous glands produce sebum, the mixture of lipids that helps form part of the skin's protective surface.
Seborrheic dermatitis tends to appear in areas with a high concentration of sebaceous glands, including the scalp, eyebrows, sides of the nose and chest.
Hormones — particularly androgens — can influence sebaceous gland activity and the amount and composition of sebum produced. Researchers therefore consider hormonal signalling one potential piece of the seborrheic dermatitis puzzle.
But here's where it becomes more interesting.
It may not simply be about how much oil your skin produces.
The composition of that oil and how it interacts with microorganisms and the skin barrier can also matter.
What does metabolism have to do with the skin?
Metabolism describes the enormous network of processes through which the body converts food into energy and regulates hormones and other biological signals.
Researchers have begun investigating whether metabolic health and seborrheic dermatitis may be connected.
A 2024 systematic review examining nutrition, obesity and seborrheic dermatitis found associations involving nutrients such as zinc, vitamin D and vitamin E, while also identifying relationships with dietary patterns and alcohol consumption. However, the researchers emphasised that more intervention-based research is needed before these associations can be turned into clear recommendations.
Another review has reported associations between seborrheic dermatitis and conditions including diabetes, hypertension and metabolic syndrome. Again, these are associations rather than proof that one causes the other.
Insulin and IGF-1: an emerging area of interest
One proposed connection involves insulin and insulin-like growth factor 1, commonly known as IGF-1.
These signalling molecules are involved in growth, metabolism and cellular activity.
Researchers have proposed that metabolic factors affecting IGF-1 and androgen signalling could potentially influence sebaceous gland activity. This is one theory being explored to explain some of the observed relationships between seborrheic dermatitis, diet and metabolic health.
It is important not to take this as evidence that insulin resistance or blood-sugar problems cause seborrheic dermatitis.
The science is still developing.
Instead, it highlights something fascinating:
The skin's oil production is influenced by signals coming from much deeper within the body.
Why hormonal changes can affect the skin
Hormonal signalling can influence the sebaceous glands, which helps explain why conditions involving sebum can change at different stages of life.
Seborrheic dermatitis itself has a characteristic pattern across age groups, with hormonal and sebaceous activity thought to contribute to its development.
This may also help explain why someone's skin can suddenly behave differently even when their skincare routine has remained exactly the same.
Sometimes the environment around the skin has changed internally.
The skin as a reflection of internal signalling
It can be tempting to divide health into separate categories:
Hormones belong to endocrinology.
Metabolism belongs to nutrition.
Inflammation belongs to immunology.
Skin conditions belong to dermatology.
But the body does not work in separate departments.
Hormones can influence sebum.
Sebum interacts with the skin microbiome.
The microbiome interacts with the immune system.
The immune system influences inflammation.
And inflammation affects the skin barrier.
That creates a much more complicated picture than simply asking, "What product should I use?"
So what should we take from this?
There is currently no single dietary or hormonal test that can explain seborrheic dermatitis in everyone, and research does not support blaming the condition on one specific food, hormone or metabolic problem.
What the emerging research does show is that seborrheic dermatitis is influenced by interconnected biological systems.
Understanding those connections may eventually lead to more personalised ways of managing the condition.
For now, the most useful takeaway is simply this:
Your skin does not exist in isolation.
Sometimes the most interesting clues about recurring skin inflammation can be found by looking beyond the surface.
