The skin is the body’s largest organ, but did you know that it’s also an indicator of internal health? Whether it’s nutritional, hormonal, immunological or metabolic, the skin can be one of the first places issues show up. Understanding that connection can help you to take care of your body and to recognise what may need further investigation.
Acne in adults is rarely just a skin problem, often indicating hormone involvement when it appears on the jaw, chin and lower face. And yet, still many of us reach for topical treatments without investing what might be fuelling the hormonal aspect.
Androgens (the group of hormones that includes testosterone) stimulate sebum production in the skin and elevates levels can be a primary driver of adult hormonal acne. Polyendocrine metabolic ovarian syndrome (PMOS) or Polycystic ovary syndrome, as it used to be known, is one of the more common underlying causes and persistent jaw and chin acne is frequently one of its more visible signs. Insulin resistance, which often accompanies this condition, worsens the picture because increased insulin stimulates further androgen production.
Chronic stress is another significant contributor to adult acne, as cortisol, the primary stress hormone triggers inflammation and stimulates sebaceous glands which is why skin often flares in periods of sustained pressure in ways that topical treatment struggles to address.
If acne persists into adulthood despite consistent skincare or if it worsens cyclically in a pattern that tacks with hormonal fluctuations, then it’s worth investigating the full hormonal picture than just continuing to treat the external symptom.
Dry skin that doesn’t respond to moisturiser is one of those symptoms that tends to trigger a habit of product-switching. We’ll keep trying a different cream in the hope that we’ll find a magic cure. The possibility that the issue may be internal is often something that goes unexplored.
The thyroid gland plays a direct role in skin cell turnover and sebum production. Hypothyroidism or underactive thyroid, slow both these processes and produces skin that is dry, rough and slow to repair. It’s also associated with hair loss, fatigue, weight changes and sensitivity to cold, which makes it difficult to diagnose until you look at the whole picture.
Nutritional deficiencies are another common driver of persistent dryness. Omega-3 fatty acids maintain the skin barrier while Zinc and Vitamin A are both involved in skin cell production and repair, B-vitamin deficiencies, particularly B12 and B2 ca present with dry, cracked skin and changes around the mouth.
For anyone with coeliac disease or compromised gut absorption more broadly, nutritional deficiencies affecting skin health are common even in people eating a relatively good diet.
Rosacea is widely recognised as a skin condition characterised by facial redness, flushing and sometimes papules or pustules but what’s less widely known is a possible association with gut health.
Research has identified a higher prevalence of small intestinal bacterial overgrowth (SIBO) in rosacea patients compared to controls, and several studies have found improvement in rosacea symptoms following treatment of the underlying gut dysbiosis. The H.pylori association is also documented although opinions and evidence here is more mixed.
It doesn’t mean that all rosacea has a gut cause but it does mean that rosacea presenting alongside other symptoms like bloating, digestive issues and food intolerances should be investigated.
Rosacea is also an immune-mediated condition and its triggers (UV exposure, alcohol, temperature extremes, foods) reflect an underlying inflammatory sensitivity that’s worth addressing systemically rather than just avoidance.
Some skin presentations are worth taking more seriously than a product-driven approach typically allows.
Acanthosis nigricans
Dark, velvety patches appearing in skin folds such as the neck, armpits, or groin is strongly associated with insulin resistance and is often an early visible marker of type 2 diabetes risk.
Slow wound healing
Cuts or abrasions that take significantly longer than expected to resolve is associated with both diabetes and nutritional deficiency, particularly in vitamin C, zinc, and protein.
Yellowing of the skin or whites of the eyes
This should always be investigated medically and promptly. Jaundice can indicate liver dysfunction, haemolytic anaemia, or other conditions that require proper assessment.
A persistent rash or skin change
A butterfly pattern across the nose and cheeks (a malar rash) is a potential indicator of lupus and warrants investigation.
Changes around the mouth specifically
Any persistent cracking at the corners, unusual patches, or slow-healing sores can reflect nutritional deficiency, Crohn’s disease, or in some cases require oral cancer screening.
Treating skin in isolation, without considering hormonal health, gut function, nutritional status, thyroid function, or inflammatory load all too often addresses the appearance of a problem rather than its source. For a significant proportion of people with persistent, unexplained, or treatment-resistant skin concerns, the more useful investigation is to look at systemic rather than topical causes.
At YOR Skin, your health is assessed alongside overall wellbeing and supported where relevant by private blood testing, nutritional review, and a clinical picture that treats the person rather than the symptom.
If your skin has been telling you something for a while, a skin and wellness consultation is a useful place to start.
