The Beauty Edit: Skin Education
A customer reached out to us recently through our live chat, concerned about a patch of darkening skin on her neck. She'd tried brightening products, assumed it was sun damage, and was frustrated that nothing was working. The answer had little to do with her skincare routine, it was something much deeper.
"It Must Be Dirt" The Hygiene Myth That Needs to End
This is perhaps the most important thing we want you to take away from this article.
When acanthosis nigricans appears; that velvety, darkened patch on the back of the neck, in the underarms, or along the skin folds. The first assumption, from the person experiencing it and often from those around them, is that it's a hygiene issue. That the skin is dirty. That scrubbing harder will fix it.
It won't. And the shame that comes with that assumption can delay someone from getting the help they actually need by months or even years.
Acanthosis nigricans is not caused by poor hygiene. It cannot be scrubbed away. It is a metabolic skin condition driven by elevated insulin levels. A signal from inside the body, not a reflection of how well someone washes. Scrubbing aggressively at the affected area will not lighten it. It will irritate the skin, compromise the barrier, and potentially worsen the appearance of the patch.
We've heard this story: someone spending years feeling embarrassed about their neck; wearing high collars, avoiding certain hairstyles, trying every brightening product on the shelf, when what they needed was a blood test and a conversation with their doctor.
If this is you, or someone you know: it is not a hygiene problem. It is a health signal. And it deserves to be taken seriously.
Is the Dark Skin on Your Neck Actually Hyperpigmentation?
This is one of the most common points of confusion, and it matters, because the treatment approach is completely different.
The short answer: no. The darkening associated with insulin resistance is a condition called acanthosis nigricans, and it is not hyperpigmentation in the traditional sense.
True hyperpigmentation such as melasma, post-inflammatory dark spots, or sun damage, is caused by an overproduction of melanin. It responds, to varying degrees, to melanin-inhibiting ingredients like vitamin C, niacinamide, kojic acid, and alpha arbutin.
If dark spots and uneven tone are your primary concern, read our full guide: How Do I Treat Hyperpigmentation and Dark Spots?
Acanthosis nigricans, by contrast, is caused by the thickening and rapid proliferation of skin cells (keratinocytes), driven by excess insulin stimulating growth factor receptors in the skin. The darkening is a result of increased cell density, not excess melanin.
This is why:
- Brightening serums and exfoliants provide little to no improvement on their own
- The texture feels velvety or slightly rough, not smooth like a flat dark spot
- The patches appear in skin folds and creases, not on sun-exposed areas
- The condition improves when insulin levels are brought under control, not when topical treatments are applied
If you are unsure whether what you're seeing is acanthosis nigricans or another form of hyperpigmentation, a dermatologist or GP can usually distinguish between the two on examination. A blood test will confirm whether insulin resistance is present.
What Is Insulin Resistance?
Insulin resistance is a metabolic condition in which your body's cells stop responding efficiently to insulin; the hormone responsible for moving glucose from your bloodstream into your cells for energy. When cells resist insulin's signal, the pancreas compensates by producing more of it. Over time, chronically elevated insulin levels trigger a cascade of effects throughout the body, including visible changes on the skin.
In South Africa, insulin resistance is increasingly common and often goes undiagnosed for years. It sits on the spectrum between normal blood sugar regulation and Type 2 diabetes, and it can affect people of any body type, age, or background, including men.
What Causes Insulin Resistance?
Insulin resistance rarely has a single cause. It typically develops through a combination of genetic predisposition and lifestyle factors that accumulate over time:
- Diet high in refined carbohydrates and sugar — frequent blood sugar spikes force the pancreas to produce more and more insulin, eventually overwhelming the cells' receptors.
- Physical inactivity — muscle tissue is one of the primary sites for glucose uptake. A sedentary lifestyle reduces the body's ability to clear glucose efficiently.
- Excess visceral fat — fat stored around the abdomen releases inflammatory signals that directly impair insulin signalling.
- Chronic stress — elevated cortisol raises blood glucose levels as part of the stress response, placing ongoing demand on insulin production.
- Poor sleep — even short-term sleep deprivation measurably reduces insulin sensitivity. Chronic poor sleep is a significant and underappreciated risk factor.
- Hormonal conditions — PCOS, hypothyroidism, and Cushing's syndrome are all associated with impaired insulin sensitivity.
- Genetics and ethnicity — South Africans of South Asian, Black African, and mixed heritage have a statistically higher predisposition to insulin resistance and Type 2 diabetes.
The Skin Signs of Insulin Resistance: A Full Picture
Acanthosis Nigricans (Dark Neck, Underarms, Skin Folds)
Velvety, darkened patches in skin folds; most commonly the back and sides of the neck, underarms, inner thighs, and groin. The earliest and most recognisable skin sign of elevated insulin. Often mistaken for dirt, sun damage, or hyperpigmentation.
Skin Tags (Acrochordons)
Small, soft growths on a stalk, typically around the neck, underarms, and eyelids. Benign on their own, but clusters of skin tags are strongly associated with insulin resistance and elevated insulin levels.
Hormonal Acne
Insulin spikes raise androgen levels, which stimulate oil production and clog pores. Typically presents along the jawline, chin, and lower cheeks in women; on the back and chest in men. If your acne is persistent and seems diet-related, insulin resistance may be a contributing factor.
Dull, Congested Skin
Chronic low-grade inflammation driven by insulin resistance impairs the skin barrier, slows cell turnover, and reduces moisture retention, leaving skin looking tired and unresponsive to topical treatment.
Slow Wound Healing
Impaired glucose metabolism affects the skin's repair mechanisms. Blemishes, cuts, and post-inflammatory marks take longer than expected to resolve.
Hirsutism (Excess Hair Growth in Women)
Elevated androgens driven by insulin resistance can cause increased facial or body hair, often alongside acne and irregular periods — a triad also associated with PCOS.
How Does Insulin Resistance Lead to Diabetes and Obesity?
Understanding the progression helps explain why early skin signs matter so much.
When cells resist insulin, the pancreas works harder to compensate, producing more insulin to achieve the same effect.
For a period, blood sugar levels remain normal, but insulin levels are already elevated. This is the stage at which skin signs like a darkening neck and skin tags often appear, even before a diabetes diagnosis.
Over time, the pancreas becomes unable to keep up with demand. Blood sugar begins to rise; first into the prediabetes range, then into Type 2 diabetes. This progression can take years or even decades, which is why insulin resistance is sometimes called a "silent" condition.
The relationship with obesity is bidirectional: excess body fat, particularly visceral fat, promotes insulin resistance, and elevated insulin levels promote fat storage, especially around the abdomen. This creates a reinforcing cycle that can be difficult to break without deliberate intervention.
The important message: insulin resistance is not a life sentence. It is one of the most reversible metabolic conditions when caught early and addressed consistently.
Can Insulin Resistance Affect Men?
Absolutely, and it is just as common in men as in women, though the skin signs are sometimes overlooked or attributed to other causes.
In men, insulin resistance can present as:
- Acanthosis nigricans on the neck, underarms, or groin
- Skin tags, particularly around the neck and torso
- Persistent adult acne, especially on the back and chest
- Increased abdominal fat (the "metabolic belly")
- Fatigue, brain fog, and energy crashes after meals
- Reduced libido (elevated insulin can suppress testosterone over time)
Men are statistically less likely to seek medical attention for skin changes, which means insulin resistance often goes undetected longer.
If any of the above sounds familiar, a simple fasting blood test is a worthwhile first step.
How to Reduce and Reverse Insulin Resistance
The good news is, insulin resistance responds well to lifestyle intervention. The skin can improve significantly as insulin levels normalise.
1. Rethink Your Plate
A low-glycaemic, whole-food diet is the single most impactful dietary change. Reduce refined carbohydrates (white bread, white rice, sugary drinks, ultra-processed foods) and prioritise fibre-rich vegetables, legumes, quality proteins, and healthy fats.
You don't need to eliminate carbohydrates; you need to choose slower-digesting ones. For a deeper dive into eating for skin and metabolic health, read our guide on the best foods for gut health. A healthy gut and stable blood sugar are more closely linked than most people realise.
2. Move Your Body Daily
Exercise, particularly resistance training and brisk walking dramatically improves insulin sensitivity by increasing glucose uptake in muscle tissue. Even 30 minutes of moderate movement per day makes a measurable difference.
3. Prioritise Sleep
Aim for 7–9 hours of quality sleep per night. Sleep deprivation raises cortisol and directly impairs insulin sensitivity. This is non-negotiable for metabolic health.
4. Manage Stress
Chronic stress keeps cortisol elevated, which keeps blood sugar elevated, which keeps insulin elevated. Breathwork, meditation, time in nature, and reducing stimulant intake all support cortisol regulation.
5. Support Your Body from the Inside Out
Certain botanicals and nutrients have evidence-backed roles in supporting insulin sensitivity, including berberine, cinnamon, magnesium, and chromium.
Our herbal wellness teas are formulated to complement a balanced lifestyle and support metabolic wellbeing from within. Learn more about how they work in our article on herbal wellness teas for glowing skin.
6. Seek Medical Support
Ask your GP for a fasting insulin test, fasting glucose, and HbA1c. These are inexpensive, widely available tests in South Africa. If insulin resistance is confirmed, a registered dietitian or functional medicine practitioner can help you build a personalised plan.
Supporting Your Skin While You Do the Internal Work
Addressing insulin resistance takes time. While your body recalibrates, a consistent topical routine can help manage inflammation, support the skin barrier, and improve overall tone and texture.
Here's how to structure your days using Sative Beauty products formulated for exactly this kind of compromised, reactive skin.
Note: topical products will not resolve acanthosis nigricans on their own, but they will support your skin's resilience and appearance throughout the process.
☀️ Morning Routine
Step 1: Cleanse Gently
Start with the Soothe + Hydrate Face Cleanser. Insulin-resistance-related skin is often inflamed and reactive. This gentle, barrier-respecting cleanser removes impurities without stripping the skin's natural moisture.
Massage onto damp skin for 60 seconds, then rinse with lukewarm water.
Step 2: Treat — Brighten and Soothe
Apply 2–4 drops of the Daily Glow Facial Treatment Serum to your face and neck. Packed with niacinamide and brightening actives, it works to reduce inflammation, inhibit melanin transfer, and support an even skin tone, all while protecting against further UV-induced damage.
Press gently into the skin; don't rub.
Step 3: Moisturise — Seal and Protect
Follow with the Brightening Daily Moisturiser Cream. This locks in your serum, supports barrier repair, and delivers lasting hydration without clogging pores.
Apply in upward, circular motions across the face and neck.
Step 4: SPF — Non-Negotiable
Finish with a broad-spectrum SPF 30 or higher. UV exposure worsens both acanthosis nigricans and any underlying inflammation.
Every morning, without exception.
🌙 Evening Routine
Step 1: Double Cleanse
Begin with an oil-based cleanser or micellar water to remove SPF and makeup, then follow with the Soothe + Hydrate Face Cleanser for a thorough, calming cleanse.
The evening cleanse is your reset, take your time with it.
Step 2: Exfoliate and Treat (2–3x per week)
On exfoliation nights, apply the Skin Rescue Exfoliating Serum to clean, dry skin. This accelerates cell turnover, helps smooth the thickened texture associated with acanthosis nigricans over time, and lifts surface congestion.
Use 2–3 times per week, not daily. Over-exfoliation will worsen inflammation.
On non-exfoliation nights, apply the Daily Glow Facial Treatment Serum instead to keep brightening actives working overnight.
Step 3: Nourish — Repair Overnight
Press 2–3 drops of the Rejuvenating Rose Bomb Facial Oil gently into the skin. Rich in rosehip seed oil and essential fatty acids. It supports overnight cell renewal, fades discolouration, and deeply nourishes a barrier that has been under chronic inflammatory stress.
Less is more, press, don't rub.
Step 4: Seal and Restore
Finish with the Brightening Daily Moisturiser Cream to lock everything in and support overnight barrier repair. Wake up to skin that feels deeply nourished and looks visibly more even.
Pro tip: Consistency beats intensity every time. Stick to this routine for 8–12 weeks alongside your internal lifestyle changes. Track your progress with weekly photos in the same lighting.
Frequently Asked Questions
Is a dark neck a sign of poor hygiene?
No, and this is one of the most harmful misconceptions around this condition. A darkening neck caused by acanthosis nigricans cannot be scrubbed away because it is not caused by dirt or poor hygiene.
It is a metabolic skin condition driven by elevated insulin levels. Scrubbing aggressively will only irritate the skin and worsen its appearance. If you or someone you know has been told to "wash better," please seek a medical opinion instead.
What does insulin resistance look like on the skin?
The most common skin sign is acanthosis nigricans, a velvety, darkened patches in skin folds, particularly on the back of the neck, underarms, and groin.
Skin tags, persistent hormonal acne, and dull or congested skin are also associated with elevated insulin levels.
Is a dark neck always a sign of insulin resistance?
Not always, but it is one of the most common causes of neck darkening that doesn't respond to brightening products.
Other causes include friction, sun exposure, and certain medications. If the darkening is velvety in texture and located in a skin fold, insulin resistance is worth investigating with a blood test.
Is acanthosis nigricans the same as hyperpigmentation?
No. Hyperpigmentation is caused by excess melanin production and responds to brightening actives like vitamin C and niacinamide.
Acanthosis nigricans is caused by the thickening of skin cells driven by elevated insulin, and it will not respond to brightening serums alone. Treating the underlying insulin resistance is the most effective approach. For melanin-driven dark spots, see our guide on how to treat hyperpigmentation and dark spots.
Can insulin resistance be reversed?
Yes, it is one of the most reversible metabolic conditions when addressed early. Dietary changes, regular exercise, improved sleep, and stress management can all significantly improve insulin sensitivity. Many people see measurable improvements in blood markers within 8–12 weeks of consistent lifestyle changes.
How long does it take for the skin to improve once insulin resistance is treated?
Skin changes driven by insulin resistance improve gradually as insulin levels normalise. Most people begin to notice a softening and lightening of acanthosis nigricans patches within 3–6 months of sustained lifestyle intervention. Hormonal acne and skin congestion often improve faster, within 6–8 weeks.
Can men get acanthosis nigricans?
Yes. Insulin resistance affects men and women equally, and acanthosis nigricans can appear in men on the neck, underarms, and groin. Men are less likely to seek medical attention for skin changes, which means the condition often goes undiagnosed longer. A fasting insulin blood test is a simple first step.
Does insulin resistance cause acne?
It can be a significant contributing factor. Elevated insulin raises androgen levels, which stimulate oil production and create the conditions for clogged pores and inflammatory breakouts — typically along the jawline and chin in women, and on the back and chest in men. If your acne is persistent and seems to worsen after high-sugar meals, insulin resistance is worth investigating.
What tests should I ask for if I suspect insulin resistance?
Ask your GP for a fasting insulin test, fasting glucose, and HbA1c. These are widely available and affordable in South Africa. A fasting insulin level above 10 µIU/mL is generally considered elevated, though interpretation should always be done in context with your full clinical picture.
Can skincare products treat acanthosis nigricans?
Topical products can support the skin's appearance and barrier function, but they cannot treat the underlying cause. Niacinamide and gentle exfoliants may help with surface texture and tone, but meaningful improvement in acanthosis nigricans requires addressing insulin levels through lifestyle and, where necessary, medical intervention. Not sure where to start? Chat with us, we're happy to help you build the right routine.
The Key Takeaway
Your skin is one of the most honest mirrors of your internal health. If you've been chasing topical fixes for a dark neck, persistent skin tags, or hormonal acne that won't budge, it may be time to look deeper.
Insulin resistance is common, often silent, and highly reversible. The earlier it's identified, the easier it is to address.
Still unsure what your skin is telling you? Chat with us on live chat just like the customer who inspired this article, you might be one conversation away from the answer you've been looking for.
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