Why acne persists after 25 and how to treat it effectively
Introduction
Acne is not exclusively a teenage condition. More and more adults — predominantly women — continue to suffer from it well past the age of 25, sometimes into their forties and beyond. Often experienced as a source of embarrassment and misunderstanding, adult acne is a dermatological condition in its own right, one that deserves appropriate and serious medical attention.
Why does acne persist after 25?
Adult acne-prone skin operates on the same basic mechanisms as juvenile acne: excessive sebum production, clogged hair follicles and bacterial proliferation. In adults, however, it is hormonal fluctuations that play the central role.
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Hair follicles are tiny channels in the skin from which hairs grow. In acne, these channels become blocked with sebum and dead skin cells, forming blackheads, whiteheads or inflammatory spots.
Androgens — male hormones present in both sexes — stimulate the sebaceous glands and increase sebum production. In adult women, any hormonal variation can trigger or worsen acne: the menstrual cycle, pregnancy, stopping hormonal contraception, or the perimenopausal period.
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Androgens are so-called « male » hormones — but they are present in everyone, both women and men. They play a key role in stimulating the sebaceous glands. An excess of androgens often manifests as persistent acne, excessive body hair or menstrual irregularities.
A systematic review published in 2025 in Health Science Reports confirms that adult acne, defined as occurring after the age of 25, affects women more frequently than men, and establishes a direct link between hormonal, genetic and dietary factors in its pathogenesis (Etiology of Adult Female Acne, Health Science Reports, 2025).
Certain conditions such as polycystic ovary syndrome (PCOS) are also associated with persistent adult acne. A report from the multidisciplinary committee on androgen excess and PCOS, published in the Journal of the Endocrine Society in 2022, highlights that adult female acne is recognised as a possible clinical expression of hyperandrogenism (Female Adult Acne and Androgen Excess, J Endocr Soc, 2022).
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Polycystic ovary syndrome (PCOS) is a common hormonal condition affecting 5 to 10% of women of childbearing age. It is characterised by an excess of androgens and can manifest as persistent acne, irregular cycles and excessive body hair. If you present these combined signs, a hormonal assessment is recommended.
Triggering factors
Beyond hormones, several factors can aggravate or maintain adult acne:
Stress is one of the main culprits. It stimulates the production of cortisol, which in turn increases sebum secretion. A single episode of intense stress can be enough to trigger a flare-up.
Diet also plays a role, although its impact is still debated in the scientific literature. High glycaemic index foods and dairy products are most frequently implicated. A balanced diet, rich in vegetables and omega-3 fatty acids, may help reduce cutaneous inflammation.
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The glycaemic index (GI) measures how quickly a food raises blood sugar levels. High-GI foods — white bread, sugary drinks, pastries — cause a rapid spike in insulin, which stimulates androgen production and, consequently, sebum secretion. Favouring low-GI foods is one of the dietary levers recommended in the management of acne-prone skin.
Comedogenic cosmetics — products liable to clog the pores — are a frequently underestimated cause. Certain moisturisers, foundations or sunscreens can maintain acne without the patient realising it. It is recommended to favour products labelled « non-comedogenic ».
The menstrual cycle is a very common trigger. Many women notice an acne flare-up in the week before their period, linked to the drop in oestrogens and the relative rise in androgens.
Effective treatments
The good news: adult acne can be treated. However, treatment must be tailored to each patient’s profile — skin type, severity of lesions, hormonal context — and often requires several weeks before showing visible results.
Topical treatments are the first line of therapy. Benzoyl peroxide, topical retinoids (adapalene, tretinoin) and local antibiotics (clindamycin) are the most widely used. They act on the bacteria responsible for acne, regulate cell turnover and reduce inflammation.
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Topical retinoids are vitamin A derivatives applied directly to the skin. They accelerate cell renewal, unblock pores and reduce inflammation. Adapalene (available without prescription) and tretinoin (on prescription) are the most widely used in dermatology against acne.
Hormonal treatments are particularly effective in women. Certain anti-androgenic contraceptive pills, or spironolactone prescribed off-label, can radically transform the skin within a few months. A 2023 review reports a reduction of more than 50% in inflammatory lesions compared to placebo, with a favourable safety profile (Efficacy and Safety of Hormonal Therapies for Acne, Dove Press, 2023).
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Spironolactone is a diuretic medication originally used to treat high blood pressure. At low doses, it has an anti-androgenic effect that makes it particularly effective against hormonal acne in women. It is prescribed off-label in this indication and requires medical supervision.
Oral antibiotics (tetracyclines) are reserved for moderate to severe forms, in combination with topical treatment, and for limited durations to avoid bacterial resistance.
Oral isotretinoin (Roaccutane) remains the gold-standard treatment for severe or resistant acne. Highly effective, it requires rigorous medical monitoring due to its potential side effects.
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Isotretinoin (known under the brand name Roaccutane) is an oral vitamin A derivative. It works by drastically reducing sebum production, unblocking pores and limiting bacterial proliferation. Due to its potential side effects (dryness, teratogenic effects), it requires strict medical supervision and contraception in women.
When to consult a dermatologist?
It is recommended to seek medical advice promptly if:
- Acne has persisted for more than 3 months despite over-the-counter treatments
- Lesions are deep, painful or cystic
- Acne is leaving scars or persistent dark spots (post-inflammatory hyperpigmentation)
- It is significantly affecting quality of life or self-esteem
- It is accompanied by other hormonal signs (excessive body hair, irregular periods)
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Post-inflammatory hyperpigmentation (PIH) refers to the dark marks left on the skin after an acne lesion has healed. They are particularly common and persistent in darker skin tones — including many North African and Middle Eastern phototypes. A dermatologist can recommend targeted depigmenting treatments to help fade them.
Prolonged self-medication can worsen the situation and delay an important diagnosis. A dermatologist will carry out a comprehensive assessment and propose a personalised treatment protocol.
Conclusion
Adult acne is a common, multifactorial and treatable condition. It cannot be reduced to a lack of hygiene or a cosmetic issue — it is a genuine skin disease that deserves serious medical attention. If you recognise yourself in this article, do not wait to seek help: effective solutions exist and they work.
Scientific references
1. Borzyszkowska D. et al. — Evaluation of Hormonal Factors in Acne Vulgaris — Cells, 2022. https://doi.org/10.3390/cells11244078
2. Karrer S. et al. — Female Adult Acne and Androgen Excess — Journal of the Endocrine Society, 2022. https://pmc.ncbi.nlm.nih.gov/articles/PMC8826298/
3. Etiology of Adult Female Acne — Systematic Review — Health Science Reports, 2025. https://pmc.ncbi.nlm.nih.gov/articles/PMC12042216/
4. Efficacy and Safety of Hormonal Therapies for Acne — Dove Press, 2023. https://www.dovepress.com/article/download/109639
Article written and published by DermInfos