Hyperpigmentation is not just “sun damage.” Dr Rinku Ratti explains the medical causes—hormones, inflammation, deficiencies, medication effects—and how to diagnose & treat pigmentation properly.
Hidden Medical Causes of Hyperpigmentation That Most People Don’t Know About
By Dr Rinku MBBS (London) MRCGP – Private GP & Women’s Health Doctor at The Doctor’s Practice, Birmingham
Instagram: @drrinkuofficial | @drrinkuofficial
Introduction
Hyperpigmentation is one of the most common concerns I see in clinic. Women tell me:
“My pigmentation has come out of nowhere.”
“No matter what I use, it always comes back.”
“I’ve spent so much on products but nothing seems to help.”
And in many cases, they’re right:
because pigmentation is often not a skincare problem — it’s a medical one.
Of course sun exposure plays a role, but in clinic I routinely diagnose underlying causes such as:
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Hormonal fluctuations
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Thyroid problems
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Insulin resistance
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Vitamin deficiencies
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Post-inflammatory skin responses
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Medication-related pigmentation
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Perimenopause-related changes
This blog uncovers the lesser-known causes of pigmentation — and why treating the root is essential.
The Deep Medical Causes of Hyperpigmentation
1. Hormonal Shifts — The Melasma Connection
Melasma is one of the most hormonally-driven pigmentation disorders.
Research published in The British Journal of Dermatology (2020) explains that fluctuations in oestrogen and progesterone increase melanocyte activity, particularly in women in their 30s–50s.
This is why pigmentation often worsens:
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During perimenopause
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With hormonal contraception
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During pregnancy
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With HRT adjustments
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Around menstrual cycle fluctuations
Women frequently tell me, “It appears in the same places every time.”
This is classic hormonal-melanocyte patterning.
2. Insulin Resistance – An Overlooked Cause of Pigmentation
One of the clearest indicators of insulin resistance is Acanthosis Nigricans—darkened, velvety pigmentation often seen on the:
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Neck
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Underarms
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Groin
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Knuckles
A 2021 study in Clinical Endocrinology found that even mild insulin resistance can lead to pigmentation via growth-factor signalling in the skin.
Women at highest risk include those with:
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PCOS
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Midlife weight gain
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Sugar cravings
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Fatigue after meals
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Family history of diabetes
This is why we often include glucose metabolism tests in our Comprehensive Health Screening:
https://www.thedoctorspractice.co.uk/health-screening
3. Vitamin Deficiencies & Anaemia
Low levels of:
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Vitamin B12
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Folate
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Iron
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Vitamin D
can all contribute to:
- Diffuse pigmentation
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Under-eye darkening
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Poor healing
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Dull, uneven tone
A review in Dermato-Endocrinology (2019) highlights the role of nutritional deficiencies in increasing oxidative stress—making pigmentation harder to fade.
You would be surprised how many patients discover their pigmentation was linked to a deficiency uncovered during their blood tests.
Our GP-led screening is here:
https://www.thedoctorspractice.co.uk/gp-services
4. Thyroid Dysfunction
Both hypothyroidism and hyperthyroidism can change the way melanocytes behave.
A 2020 paper in Endocrinology Research demonstrated that thyroid hormones influence melanin production, contributing to:
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Generalised darkening
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Facial pigmentation
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Patchy uneven tone
Women often present with fatigue, hair changes and pigmentation together — and thyroid imbalance is the link.
5. Post-Inflammatory Hyperpigmentation (PIH)
PIH happens after:
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Acne
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Eczema
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Sunburn
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Injuries
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Picking/squeezing spots
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Allergic rashes
Inflammation triggers excess melanin production.
This is particularly common in skin of colour, and can last months to years without proper treatment.
Treating PIH often requires:
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Identifying the inflammatory trigger
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Reducing inflammation medically
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Gentle skin therapies (chemical peels, microneedling, polynucleotides)
Our doctor-led aesthetic department manages this precisely:
https://www.thedoctorspractice.co.uk/aesthetics
6. Medication-Induced Pigmentation
Some medications are known to cause pigmentation, especially:
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Oral contraceptives
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Anticonvulsants
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Certain antibiotics (tetracyclines)
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NSAIDs
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Chemotherapy
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Amiodarone
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Anti-malarials
A review in Drug Safety (2021) showed drug-induced pigmentation can persist even after stopping the medication.
This is why your medication history is crucial.
Myths & Facts (Bullet Format)
Myth: Hyperpigmentation is just sun damage.
Fact: Hormones, deficiencies, inflammation, medications and thyroid issues all contribute.
Myth: Only laser treatments can fix pigmentation.
Fact: Internal metabolic and hormonal correction is often far more effective.
Myth: Vitamin C alone can cure pigmentation.
Fact: It helps — but won’t work if underlying inflammation or hormones are unbalanced.
Myth: Pigmentation will fade on its own if you avoid the sun.
Fact: Without treating root causes (hormones, insulin, deficiencies), it often persists or returns.
Myth: Only older women get pigmentation.
Fact: Melasma, PIH and medication-related pigmentation can occur at any age.
Evidence-Based Treatments That Actually Work
1. Medical Screening First — Not Guesswork
We start by identifying underlying triggers such as:
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Hormonal imbalance
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Iron, B12, folate, vitamin D deficiency
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Thyroid disorders
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Insulin resistance
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Post-inflammatory triggers
This is why many patients start with a Health Screening to uncover hidden metabolic links:
https://www.thedoctorspractice.co.uk/health-screening
2. Hormonal Management for Melasma
This may include:
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Adjusting contraception
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Managing perimenopause
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Treating PCOS
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Considering HRT optimisation
A 2023 review in Women’s Dermatology shows HRT adjustments can significantly impact pigmentation.
3. Repletion of Key Deficiencies
Correcting deficiencies can support:
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Faster fading of pigmentation
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Better skin healing
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Reduced oxidative stress
This often includes:
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Vitamin D
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B12 / folate
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Iron
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Zinc
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Omega-3
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Antioxidant-rich diet
4. Aesthetic Treatments (Doctor-Led)
Once the medical side is addressed, pigmentation responds far better to:
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Chemical peels (for PIH, melasma, Cosmelan)
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Polynucleotides (improves inflammation + texture)
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Microneedling (evens tone, boosts collagen)
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Skin boosters (restore hydration, reduce dullness)
Our clinic specialises in doctor-led skin treatments:
https://www.thedoctorspractice.co.uk/aesthetics
5. Daily Skin Routine That Makes a Difference
Morning:
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Gentle cleanser
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Vitamin C serum
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SPF 50 (non-negotiable)
Evening:
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Retinoid (if suitable)
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Niacinamide
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Barrier-repair moisturiser
Weekly:
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Exfoliation
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In-clinic treatments if advised
Most importantly: consistency and medical guidance.
How We Assess Hyperpigmentation at The Doctor’s Practice
Your consultation includes:
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Full skin examination
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Hormonal review (where relevant)
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Medication review
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Blood tests for deficiencies + thyroid + insulin resistance
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Inflammation mapping
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Menopause/perimenopause review
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Aesthetic suitability assessment
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Bespoke skin plan
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Ongoing follow-up
This integrated model — GP + women’s health + aesthetics — is what makes results stronger and longer lasting.
Frequently Asked Questions
1. Why is my pigmentation getting worse as I age?
Hormonal changes, slower cell turnover, sun history and deficiencies all contribute.
2. Is there a cure for melasma?
There’s no cure, but it can be controlled with medical management, skin treatments and consistent SPF.
3. Do I need blood tests?
If pigmentation is persistent or worsening — yes, it’s extremely helpful.
4. Can pigmentation be removed permanently?
Some types can; others (like melasma) require long-term management.
5. Will vitamin supplements help?
Only if you are deficient. Testing is essential.
6. Is laser good for pigmentation?
It depends on the type. For some pigmentation, laser worsens it.
7. What’s the best treatment for hormone-related pigmentation?
Treat the hormones first, then aesthetic treatments.
A Personal Note from Dr Rinku
Some of the most frustrated patients I’ve seen have been women battling pigmentation. They’ve tried every cream online, sometimes spent thousands — and still felt defeated.
One patient told me:
“I thought I was doing something wrong. I didn’t realise it was my hormones and deficiencies and using the wrong products.”
Once we corrected her vitamin D, balanced her perimenopausal hormones and treated her PIH gently — her pigmentation softened dramatically within months.
Pigmentation is treatable.
You just need the right diagnosis, combined with medical grade skin care tailored to your skin and regular review. .
Book an Appointment
The Doctor’s Practice – Edgbaston, Birmingham
🌐 https://www.thedoctorspractice.co.uk
📞 0121 661 2366
💬 WhatsApp: 07388 623527
📍 7 Chad Sq, Hawthorne Road, Edgbaston, B15 3TQ
Instagram: @drrinkuofficial | @thedoctorspractice
References
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Sarkar R, et al. Melasma: A comprehensive update. Br J Dermatol. 2020.
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Choudhary S, et al. Insulin resistance and its dermatological manifestations. Clin Endocrinol. 2021.
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Bhat YJ, et al. Cutaneous signs of nutritional deficiency. Dermato-Endocrinology. 2019.
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Lee AY. Recent progress of melasma pathogenesis. Endocrinol Res. 2020.
Awesome blog.
Great Post.
Awesome blog.