PCOS (Now PMOS) and Your Skin: A GP’s Guide to Hormonal Acne, Facial Hair, Hair Thinning and Dark Patches

Last updated: 2 November 2026

If you have polycystic ovary syndrome, now officially renamed PMOS, you may have been told it is a fertility condition, or a weight condition, or something to think about later. For many of the women I see as an NHS GP, the first and most persistent symptoms are on the skin: stubborn acne along the jaw, hair where you do not want it, thinning where you do, and dark velvety patches on the neck. These are not vanity problems. They are visible signs of a hormonal and metabolic condition, they affect confidence enormously, and they are often managed badly because nobody joins up the medical and the skin care.

This guide does the joining up. I will explain what PCOS does to skin and why, what the May 2026 rename changes, how the condition is actually diagnosed (and why "I have cysts on a scan" is not the same thing), what you can ask your own GP for, what the evidence says about hair removal and acne treatment, and where a skin clinic like mine in Hale fits once the medical side is being looked after. One line runs through the whole article: I can help with the skin; your GP needs to look after the hormones.

In this article:

• Why has PCOS been renamed PMOS, and what has changed?
• How does PCOS affect skin and hair?
• How is PCOS actually diagnosed?
• Why does PCOS cause facial hair, and what helps?
• Why does PCOS cause acne, and what helps?
• Can PCOS cause scalp hair thinning?
• What are the dark patches on my neck?
• What should you ask your GP?
• Where does a skin clinic fit?
• Frequently asked questions

Why has PCOS been renamed PMOS, and what has changed?

On 12 May 2026 a global consensus published in The Lancet renamed polycystic ovary syndrome as polyendocrine metabolic ovarian syndrome, or PMOS. The process took fourteen years and drew on input from more than 14,000 patients and health professionals, and the new name will be phased in over three years, with full adoption in the 2028 international guideline. You will see both names for a while, including on NHS pages, and in this article I use PCOS because it is still what most people search for and say in my consulting room.

What has changed	What has not
The name. "Polycystic" was misleading: many women with the condition have no cysts, and the cysts are not cysts at all but immature follicles	The condition itself, and the way it is diagnosed and treated
The emphasis. "Polyendocrine metabolic" names what the condition is: a lifelong hormonal and metabolic disorder affecting insulin, androgens, weight, mood, heart health and skin, not only ovaries	Your diagnosis. If you have PCOS you have PMOS; nobody needs re diagnosing
The hope, which is that a name reflecting the whole condition leads to earlier recognition, including from skin symptoms	The size of the problem: around one in ten women in the UK according to the NHS, and more than 170 million people worldwide

"Renaming this condition is more than semantics." Dr Melanie Cree, paediatric endocrinologist and member of the international consensus group, May 2026.

For skin, the rename matters because it puts insulin resistance at the centre of the condition. Insulin resistance drives much of the acne, the hair growth and the dark neck patches, which is why diet, movement, weight management and, where appropriate, medicines that improve insulin sensitivity can improve skin as well as everything else.

How does PCOS affect skin and hair?

Three things happen in PCOS that show on the surface. The ovaries and adrenal glands make more androgens (male pattern hormones such as testosterone). Cells become less responsive to insulin, so the body makes more of it, and high insulin pushes androgen production higher still. And ovulation becomes irregular, which unsettles the cycle and the hormones that ride on it. The skin and hair follicles respond to all three.

Sign	Why PCOS causes it	How common
Acne, especially jaw, chin and neck	Androgens enlarge oil glands and thicken the lining of pores; insulin adds to both	61% of women in a 2016 study of 401 women with PCOS; a 2021 meta analysis found acne in 43% of women with PCOS against 21% without
Excess facial and body hair (hirsutism)	Androgens convert fine vellus hair on the upper lip, chin, chest and abdomen into thick, dark terminal hair	53% in the same study; NICE notes PCOS accounts for more than 70% of all hirsutism
Scalp hair thinning	The same androgens shrink follicles on the crown and parting (female pattern hair loss)	Around one in five women with PCOS, roughly five times the rate in women without, in a 2025 meta analysis
Dark velvety patches (acanthosis nigricans)	High insulin stimulates skin cells and pigment in the folds: neck, armpits, groin	37% in the 2016 study; a marker of insulin resistance rather than a skin problem in its own right
Oily skin, skin tags, post acne marks	Oil from androgens; skin tags from insulin; marks from inflamed spots in skin that pigments easily	Very common, and often what brings women to a skin clinic

One sign on its own does not mean you have PCOS. Plenty of women have hormonal acne or a few chin hairs with entirely normal hormones. A combination, particularly with irregular periods, is the pattern that should prompt a conversation with your GP.

How is PCOS actually diagnosed?

This is where my GP hat matters, because the diagnosis is widely misunderstood, including by people who have it. PCOS is a clinical diagnosis made on a combination of features, not a scan finding.

Criterion (two of three needed)	What it means in practice	Worth knowing
Irregular or absent ovulation	Cycles longer than 35 days, fewer than eight periods a year, or none	The pill masks this, so the diagnosis is often missed until women stop it
Signs or blood tests of excess androgens	Hirsutism, persistent acne or hair thinning count as clinical signs even if the blood tests are normal	This is why your skin is part of the diagnosis, not a side issue
Polycystic ovaries on ultrasound, or a raised AMH blood level	Many small follicles on scan; since the 2023 international guideline an AMH blood test can replace the scan in adults	Up to a quarter of women with normal hormones have polycystic looking ovaries; the scan alone never makes the diagnosis

Before confirming PCOS a GP will usually check thyroid function, prolactin and sometimes other hormones to exclude conditions that mimic it, and will think about long term health: PCOS raises the risk of type 2 diabetes, high blood pressure, sleep apnoea and low mood, which is why the metabolic side deserves attention even when the skin is what brought you in. If you suspect PCOS, book a GP appointment, keep a note of your cycle for a few months, and take photographs of your skin at its worst; both make the consultation far more useful.

Why does PCOS cause facial hair, and what helps?

Facial hair is the symptom women tell me they find hardest, and the one they are least likely to raise unprompted. The hair follicles on the upper lip, chin and jaw are exquisitely sensitive to androgens, and once a follicle has been converted to produce thick dark hair, lowering the hormone slows new conversions but does not reverse the ones already made. That is why the medical treatment and the hair removal have to run together: one turns down the tap, the other deals with what is already there.

Approach	What the evidence says	Where to get it
Hormonal treatment from your GP	The combined pill lowers free androgens and is first line in the international guideline; anti androgen medicines may be added by a GP or specialist if the pill alone is not enough after six months. Expect slow improvement over six to twelve months	Your GP, with specialist input if needed
Prescription cream to slow facial hair growth	A cream that slows the growth of facial hair can be prescribed; it works while you use it and suits women who cannot or prefer not to take hormones	Your GP
Laser or light based hair removal	Recommended for consideration in the 2023 international PCOS guideline; a 2024 systematic review found laser and light reduce hirsutism, with low quality evidence overall. Needs a course, works best on dark hair, needs maintenance, and results fade over one to three years without it	A reputable laser clinic; I do not offer laser, and I am happy to say what to look for
Electrolysis	The only method that can permanently destroy individual follicles; slow, so best for small areas such as the chin, and for fair, grey or red hair that laser cannot see	A qualified electrologist
Shaving, threading, waxing, plucking	Shaving does not make hair thicker, whatever your grandmother said. Plucking and waxing can inflame follicles and cause ingrown hairs and dark marks in skin that pigments easily	At home; shaving or trimming is the kindest to the skin

Why does PCOS cause acne, and what helps?

PCOS acne has a signature: deep, tender spots along the jawline, chin and upper neck that flare in the week before a period and leave marks that outlast the spot by months. It often starts or returns in the twenties and thirties, long after teenage acne should have gone, and it responds poorly to the washes and spot treatments that work for teenagers because the driver is hormonal rather than bacterial.

Stage	Medical care (your GP or dermatologist)	Skin care and skin clinic role
Active acne	Treating the hormones treats the acne: the combined pill (some types are licensed for acne), anti androgens, and medicines that improve insulin sensitivity where appropriate. Prescription topical treatments and, for severe or scarring acne, referral to a dermatologist for stronger options	A simple, non stripping routine: gentle cleanser, a retinoid or azelaic acid as advised, light non comedogenic moisturiser and SPF. Medical grade skincare designed for oily, congestion prone skin can support medical treatment; it does not replace it
Post acne marks (red or brown)	Settles once new spots stop; the pigment is in the skin, not the hormones	This is where I can help most: prescription grade retinoids and pigment regulators, superficial peels such as the Obagi Blue Peel Radiance, strict daily SPF; see my guide to marks left after spots
Scarring (ice pick, rolling, boxcar)	Prevention: early, effective medical treatment is the single best anti scarring measure	Once acne is controlled, medical microneedling, with or without exosomes, over a course; see the best treatments for acne scars
Oily, enlarged pores, uneven texture	Improves as androgens are controlled	Retinoids, peels, and polynucleotides for texture and resilience

Two practical points from the GP chair. First, if your acne is scarring, do not wait: ask for referral early, because scars are far harder to treat than spots. Second, if you have PCOS and acne, ask whether your acne treatment is also treating your PCOS; a plan that does both is better than two plans that ignore each other. The link between diet, insulin and breakouts is also real and worth reading about, because lower glycaemic eating helps PCOS skin through the insulin pathway.

Takeaway: PCOS skin problems are hormone problems wearing a skin disguise. Treat the hormones with your GP, and the skin becomes far easier to help.

Can PCOS cause scalp hair thinning?

Yes, and it is a cruel pairing with hair growth elsewhere. The same androgens that thicken chin hair shrink the follicles on the crown and widen the parting, producing female pattern hair loss, which affects around one in five women with PCOS. Before anyone blames hormones, though, the other common causes need excluding: low iron (ferritin), thyroid problems, vitamin D deficiency, crash dieting and the shedding that follows illness or stress. A GP blood test is the first step, not a scalp treatment. Where the cause is androgen driven, your GP may discuss the pill, anti androgens or a topical treatment that encourages regrowth, all of which take six months to judge. I wrote a longer GP guide to shedding versus thinning and what helps, and the honest answer for PCOS is that hair thinning is managed medically and patiently rather than fixed in a clinic.

What are the dark patches on my neck?

Patients often show me a dark, slightly velvety band on the back or sides of the neck, in the armpits or under the breasts, and ask for something to lighten it. Nine times out of ten it is acanthosis nigricans, and it is not a pigmentation problem to bleach away. It is a visible marker of insulin resistance, and the treatment is improving insulin sensitivity: weight management where relevant, activity, lower glycaemic eating and, for some women, medication from their GP. It fades as the metabolic picture improves. It is important to tell it apart from the other dark marks PCOS skin collects.

Type of darkening	How to recognise it	What helps
Acanthosis nigricans	Velvety, thickened, symmetrical, in skin folds: neck, armpits, groin, knuckles	Treating insulin resistance with your GP; gentle keratolytic creams can soften texture; it is not a bleaching job
Post inflammatory marks	Flat brown or red spots exactly where spots or ingrown hairs were, worse on the jaw and chin	Stopping new spots, daily SPF, prescription retinoids and pigment regulators, superficial peels; the Obagi Nu-Derm programme following consultation for stubborn cases
Melasma	Symmetrical brown patches on cheeks, forehead or upper lip, worse in summer, often triggered by the pill or pregnancy	Sun protection above all, then pigment regulating skincare; see melasma versus sun spots. Tell your GP if it started with a hormonal contraceptive

What should you ask your GP?

GP appointments are short, and PCOS is a condition that benefits from going in prepared. This is the list I would give a friend.

Ask about	Why it matters	Bring with you
Whether your symptoms fit PCOS and what tests you need	Testosterone, SHBG, thyroid, prolactin, and sometimes AMH; a scan is not always needed	Three months of cycle dates; photos of your skin at its worst
Your metabolic health	HbA1c or glucose, cholesterol, blood pressure and weight; PCOS raises diabetes risk and these should be checked regularly	Family history of diabetes or heart disease
Which treatment addresses the skin as well as the cycle	Some options help acne and hair; others do not. Say explicitly that the skin matters to you	A list of what you have already tried
Referral if acne is scarring or hair loss is marked	Dermatology can offer treatments a GP cannot; scarring acne qualifies	Photos showing scars, not just spots
Your mood	Low mood and anxiety are more common in PCOS and visible symptoms are a large part of why; it is a legitimate thing to raise	Honesty; GPs would rather know
Future fertility, if relevant	Most women with PCOS conceive, some need help; knowing early allows planning	Your timescale, even if vague

Where does a skin clinic fit?

Clearly, and in second place. I am a GP, but at my clinic in Hale I am working as an aesthetic doctor, and the clinic is not the place where PCOS is diagnosed or treated; that belongs with your own GP and, where needed, a specialist. What the clinic can do is look after the skin consequences properly once the medical side is in hand, which is something NHS care rarely has time for.

Concern	What I can do	What I will not pretend to do
A skincare routine that suits oily, breakout prone, easily marked skin	A proper skin assessment and a medical grade routine built around a retinoid, pigment control and SPF, prescribed following consultation where appropriate	Treat active acne in place of your GP; skincare supports medical treatment, it does not replace it
Red and brown marks after spots or ingrown hairs	Superficial peels (Obagi Blue Peel Radiance, The Perfect Peel) and prescription pigment programmes, chosen carefully for darker skin tones	Lighten acanthosis nigricans; that needs the insulin addressed
Acne scarring	A course of medical microneedling, with exosomes where appropriate, once the acne has been quiet for several months	Needle through active acne, which spreads inflammation and worsens marks
Dull, uneven, oily texture	Peels, retinoids and polynucleotides for skin quality	Promise that any of it works while the hormones are untreated
Facial hair and scalp thinning	Honest advice on what to ask your GP for and what to look for in a laser or electrolysis provider	Offer hair removal or hair loss injections; I do not provide them
Confidence	Take the skin seriously, explain it properly and build a realistic plan; most women with PCOS have never had that	Sell you a transformation; PCOS skin is managed, not cured

In practice the best outcomes I see come from a simple sequence: GP first for diagnosis, metabolic checks and hormonal treatment; a sensible skincare routine straight away; and clinic treatments for marks, scarring and texture once the acne has quietened. The order matters. Expensive peels on skin that is still breaking out are money spent in the wrong place, and I will say so. Treating the hormones with your GP makes everything I do work better, and sometimes makes it unnecessary.

Takeaway: PCOS is now PMOS, a whole body hormonal and metabolic condition that shows on the skin first. Ask your GP for the diagnosis and the hormones; ask a skin clinic for the marks, the texture and the routine, in that order.

Frequently asked questions about PCOS, PMOS and your skin

Is PMOS the same as PCOS?

Yes. Polyendocrine metabolic ovarian syndrome is the new name agreed in May 2026 for the same condition. Nothing about your diagnosis or treatment changes; the name now reflects that it is a hormonal and metabolic condition, not one about ovarian cysts.

Can PCOS cause acne in your 30s and 40s?

Yes. Hormonal acne along the jaw, chin and neck that flares before a period is one of the commonest presentations of PCOS in adult women, and it often appears or returns after stopping the pill.

Can you have PCOS without cysts on a scan?

Yes. The diagnosis needs two of three features: irregular ovulation, signs or blood tests of excess androgens, and polycystic ovaries on scan or a raised AMH. Many women are diagnosed on the first two alone, which is partly why the name has changed.

What is the best treatment for PCOS facial hair?

A combination: hormonal treatment from your GP to slow new growth, and laser or electrolysis for the hair that is already there. Laser is recommended for consideration in the 2023 international guideline, works best on dark hair, and needs maintenance. Shaving is the kindest home option and does not make hair thicker.

Does the pill help PCOS skin?

Often, yes. The combined pill lowers free androgens and is first line in the international guideline for both acne and hirsutism; some types are specifically licensed for acne. Whether it suits you is a decision for you and your GP, taking into account your medical history.

Can metformin help PCOS acne?

Medicines that improve insulin sensitivity can improve skin in some women because insulin drives androgen production, although they are not acne treatments as such. Your GP can advise whether one is appropriate for your overall metabolic picture.

Why do I get dark skin on my neck with PCOS?

That is usually acanthosis nigricans, a marker of insulin resistance. It responds to improving insulin sensitivity through weight management, activity, lower glycaemic eating and sometimes medication, rather than to lightening creams or peels.

Can PCOS cause hair loss?

Yes, female pattern thinning at the crown and parting affects around one in five women with PCOS. Have iron, thyroid and vitamin D checked first, as these are common and treatable alternative causes.

Does diet affect PCOS skin?

Yes, through insulin. Lower glycaemic eating, regular meals and adequate protein reduce insulin spikes, which lowers androgen drive and can calm acne and oiliness over months. It is a support, not a substitute for medical treatment.

Can an aesthetic clinic treat PCOS?

No. PCOS is a medical condition diagnosed and managed by your GP and specialists. A doctor led skin clinic can help with the skin consequences, such as post acne marks, scarring, texture and a suitable skincare routine, alongside that care.

When should I see a GP about PCOS?

If you have irregular or absent periods together with acne, excess hair, hair thinning or dark skin patches; if you are struggling to conceive; or if your acne is leaving scars. Sooner is better, because both the skin and the metabolic risks are easier to manage early.

Next steps

If you have PCOS and your skin has never been taken seriously, I would be glad to see you at the clinic in Hale for a skin assessment, build a routine that works with your treatment from your GP, and plan any clinic treatments for the right moment. If you have not yet had a diagnosis, start with your own GP; this article should help you ask the right questions.

Learn more about Dr Caroline Warden Clinic

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Learn more about other treatments offered

Further reading

• The Best Treatments for Acne Scars
• Post Inflammatory Pigmentation: The Marks Left After Spots
• The Gut Skin Axis: How Your Diet Could Be Causing Breakouts
• How Hormones Affect Your Skin and When Aesthetic Treatments Can Help
• Melasma vs Sun Spots: Telling Them Apart
• Medical Grade Skincare in Hale and Altrincham
• Medical Microneedling in Hale and Altrincham (for acne scarring)

Dr Caroline Warden (GMC 6157708) is an NHS GP with over 19 years of clinical experience, an independent prescriber, and holds a Level 7 postgraduate diploma in cosmetic injectables. She has practised aesthetic medicine since 2017 and runs Dr Caroline Warden Skin & Aesthetic Clinic with her sister Louise at 2 Crown Passages, Hale, Cheshire, WA15 9GN, serving patients from Hale, Altrincham, Bowdon, Hale Barns, Timperley, Sale, Alderley Edge, Wilmslow, Knutsford, Didsbury and across Cheshire and South Manchester. You will only ever be seen and treated by Dr Warden. The clinic does not diagnose or treat PCOS or other medical conditions; medical care should be sought from your own GP. Prescription only medicines are prescribed following a face to face consultation and are not promoted in this article. The clinic is an authorised Obagi stockist and ambassador clinic. This article provides general educational information and does not replace an individual assessment. Information correct as of November 2026.

References

1. Cree M, et al. Renaming polycystic ovary syndrome: an international consensus. The Lancet, 12 May 2026. Read the Endometriosis UK summary
2. NHS. Polycystic ovary syndrome (PCOS): overview, symptoms, diagnosis and treatment. Read the NHS page
3. Teede HJ, Tay CT, Laven J, et al. Recommendations from the 2023 international evidence based guideline for the assessment and management of polycystic ovary syndrome. Human Reproduction 2023;38(9): pages 1655 to 1679. Read the guideline
4. Schmidt TH, Khanijow K, Cedars MI, et al. Cutaneous findings and systemic associations in women with polycystic ovary syndrome. JAMA Dermatology 2016;152(4): pages 391 to 398. Read the study
5. NICE Clinical Knowledge Summaries. Hirsutism: causes and assessment. Read the NICE summary
6. NICE Clinical Knowledge Summaries. Polycystic ovary syndrome. Read the NICE summary
7. British Association of Dermatologists. Patient information leaflets: acne, hirsutism, female pattern hair loss and acanthosis nigricans. Browse the leaflets