Polycystic ovary syndrome (PCOS) is one of the most common hormonal disorders in women. Yet people often overlook how much it affects the skin. It affects up to 13% of women of reproductive age worldwide. Even so, up to 70% of those who have it stay undiagnosed. In fact, many people do not realise how far its reach extends, from acne and excess hair to scalp thinning. In May 2026, a global consensus even renamed the condition polyendocrine metabolic ovarian syndrome, or PMOS, to capture that wider picture. This article explains what PCOS is and how doctors diagnose it. It also covers the ways it shows up on your skin and hair, and the treatments that help.
What is PCOS?
At its core, polycystic ovary syndrome is a complex endocrine disorder. It mainly affects women of reproductive age. Here, the ovaries produce an unusually high level of androgens, the male sex hormones that women normally carry in small amounts. This excess usually comes with irregular periods and, in many cases, polycystic ovaries. These small fluid-filled sacs show up on an ultrasound scan. From there, PCOS can present in several ways. These include fertility issues, metabolic problems like insulin resistance, and visible concerns such as hirsutism, acne and scalp thinning.
The exact cause is still unknown. Most experts, though, see it as multifactorial, shaped by genetic, environmental and lifestyle factors. Despite the name, not every woman with PCOS has ovarian cysts. Likewise, having cysts does not by itself mean a woman has PCOS. Still, it is a condition worth taking seriously. It is a leading cause of infertility, and it carries long-term health risks such as type 2 diabetes, cardiovascular disease and endometrial cancer. For that reason, early diagnosis and management matter.
Why Has PCOS Been Renamed PMOS?
For decades, the name polycystic ovary syndrome has frustrated doctors and patients alike, because it is something of a misnomer. The cysts seen on an ultrasound are not true cysts at all, but arrested follicles, and the condition reaches far beyond the ovaries. So in May 2026, a global consensus of more than 50 patient and professional bodies renamed it polyendocrine metabolic ovarian syndrome, or PMOS.
The new name does more useful work. Polyendocrine reflects the many hormones involved, from insulin to androgens, whilst metabolic acknowledges the insulin resistance and long-term risks at its core. Crucially, the hope is that a clearer name will cut the long diagnostic delays and stigma that have dogged the condition. It also reframes PMOS as the whole-body hormonal disorder it has always been, rather than a problem of the ovaries alone. Throughout this article we still use PCOS, since it remains the term most people know, though you may now see both.
How is PCOS Diagnosed?
Diagnosing PCOS is rarely straightforward, because there is no single definitive test. Instead, it rests on piecing together symptoms, examination, medical history and blood tests. The widely used Rotterdam criteria give a helpful framework. They require at least two of these three features:
- Irregular or absent periods, which point to abnormal ovulation.
- Clinical or biochemical signs of hyperandrogenism, meaning excess male hormones.
- Polycystic ovaries visible on ultrasound.
Blood tests add useful detail. In practice, doctors measure hormones such as testosterone, luteinising hormone and follicle-stimulating hormone to map the imbalance. Additionally, they test to rule out lookalike conditions such as thyroid disorders. Because there is no outright cure, diagnosis matters mostly because it steers management towards the symptoms that affect each person.
How Does PCOS Affect Your Skin and Hair?
PCOS affects the skin more than almost any other hormonal condition. Crucially, the link comes directly from the androgen excess at its core. Research consistently finds acne, hirsutism and hair loss to be its key skin markers. These are the most common ways it shows up:
- Acne and oilier skin: Higher androgens drive more sebum. As a result, it sets the stage for acne that differs from typical teenage or adult acne. This hormonal acne tends to be deeper and more persistent, clustered around the lower face, jawline and neck.
- Skin tags: These small, soft, flesh-coloured skin tags often appear in folds such as the neck, armpits and under the breasts. They are harmless, though they often signal the insulin resistance common in PCOS.
- Acanthosis nigricans: This shows as dark, velvety patches of acanthosis nigricans in the same folds. It is another visible marker of insulin resistance.
- Hirsutism: Excess androgens can prompt coarse hair growth in a male pattern, such as on the chin, jaw, chest or stomach. For many women, this is one of the most distressing features.
- Hair thinning: At the same time, the scalp can thin in a female pattern, known as female pattern hair loss.
How Are the Skin Symptoms of PCOS Treated?
Because PCOS has no cure, treatment focuses on the symptoms that trouble you most. The skin side often needs its own plan, alongside any hormonal management from your GP. Lifestyle changes matter as a foundation too. A balanced diet, regular exercise and steady weight management can ease insulin resistance and, in turn, the skin signs.
On the skin itself, hormonal acne usually responds best to targeted prescription actives rather than off-the-shelf products. Azelaic acid calms inflammation and helps with both spots and the marks they leave. Clindamycin, meanwhile, targets acne-causing bacteria. For hormonally driven acne and hirsutism, spironolactone is an anti-androgen that our spironolactone guide explains in full. Scalp thinning follows the same treatment lines as female pattern hair loss. Where breakouts are the main concern, treating PCOS acne online with a tailored routine tends to beat a generic one.
PCOS is a lifelong condition, but its effects on your skin and hair are far from untreatable. The right mix of medical care, lifestyle changes and targeted skincare goes a long way. With it, you can improve and control most of its visible signs.
At City Skin Clinic, we are passionate about personalised skincare. Our doctors design custom treatments using actives like tretinoin, azelaic acid, clindamycin and spironolactone where appropriate. We treat acne, hyperpigmentation and hair loss in women through bespoke compounded treatments designed around you. To begin, book a video consultation or complete an online consultation form. From there, your dedicated doctor will guide you. The journey towards great skin and hair starts here.
This article is intended for general informational purposes only and is not a substitute for medical advice, diagnosis or treatment. Always consult a qualified medical provider for any medical concerns or questions you might have.
