Acne is far from just a teenage concern. Adult acne affects approximately 25% of women and 12% of men, and its incidence is increasing. Adult acne — particularly hormonal acne in women — has a distinct pattern, mechanism and optimal treatment approach that differs meaningfully from adolescent acne.
How Adult Hormonal Acne Differs
Adolescent acne is driven by surging androgens at puberty, producing widespread oiliness and breakouts across the T-zone, chest and back. Adult hormonal acne is: predominantly lower-face (jaw, chin, lower cheeks, neck) — reflecting higher androgen-receptor density in this area; cyclical in women — worsening 7–10 days before menstruation as oestrogen falls and progesterone rises; deeper and more inflammatory — nodules rather than surface blackheads; more likely to scar; and occurring on drier, more sensitive skin than teenage skin.
The Hormonal Mechanism
Androgens (testosterone and DHT) stimulate sebaceous glands to produce excess sebum and cause follicular hyperkeratinisation — skin cells that don’t shed properly, blocking pores. In women, premenstrual acne flares relate to the oestrogen drop in the luteal phase (which removes anti-androgenic protection) and progesterone’s mild androgenic effects. PCOS — characterised by elevated androgens — is a common underlying cause of persistent adult acne in women.
Evidence-Based OTC Ingredients
Adapalene 0.1% (Differin gel) — now available OTC in the UK. The gold-standard acne ingredient: a retinoid that regulates epidermal turnover, prevents comedone formation, and has anti-inflammatory properties. Requires 8–12 weeks of consistent use. Causes initial “purging” (temporary increase in spots as existing microcomedones come to the surface). Causes photosensitivity — apply at night, use SPF daily. Start every-other-night to minimise irritation on adult skin. Niacinamide (5–10%) — regulates sebum production, anti-inflammatory, reduces post-inflammatory hyperpigmentation. Excellent tolerance on adult, sensitive skin. Can be used twice daily and is an ideal base for adult acne routines. Azelaic acid (10%) — antibacterial, reduces pigmentation, anti-inflammatory. Available OTC at 10%. Particularly useful for adult acne with associated hyperpigmentation. Safe in pregnancy. Benzoyl peroxide (2.5–5%) — kills C. acnes bacteria. More irritating on adult skin — use lower concentration and apply only to spots rather than whole face initially.
Dietary Factors in Adult Acne
Dairy — a consistent dietary trigger in multiple studies. Dairy (particularly skimmed milk) contains IGF-1 precursors and androgens that stimulate the acne pathway. A 4-week dairy elimination trial is worthwhile in persistent adult acne. High-glycaemic diet — rapidly absorbed carbohydrates spike insulin and IGF-1, both of which stimulate androgen production. A low-GI diet is associated with reduced acne severity in RCTs. Stress — cortisol stimulates sebaceous androgen receptors, explaining stress-related flares.
Frequently Asked Questions About Adult Acne
Why is my acne worse before my period?
In the luteal phase (second half of the cycle), oestrogen falls while progesterone rises. Progesterone has mild androgenic effects and removes the anti-androgenic protection oestrogen provides. Sebum production increases. The week before menstruation — when both hormones fall sharply — is often the worst point. This predictable cyclical pattern is the defining feature of hormonal acne. Pre-treating with a topical retinoid or benzoyl peroxide in the week before expected flares is a practical strategy.
How long before OTC acne products work?
Adapalene requires 8–12 weeks of consistent daily use to show meaningful improvement. The initial “purge” lasts 4–8 weeks. Niacinamide begins showing benefits within 4 weeks. Benzoyl peroxide works faster (2–4 weeks for active spots) but doesn’t address the underlying comedone formation. Don’t judge a treatment before 12 weeks of consistent use.
When should I see a GP for adult acne?
See a GP if: OTC treatment after 12 consistent weeks produces no improvement; acne is causing scarring (nodular/cystic acne particularly risks permanent scars); acne is accompanied by other signs of androgen excess suggesting PCOS (irregular periods, hirsutism, hair thinning); or acne is causing significant psychological distress. Prescription options include stronger topical retinoids, topical and oral antibiotics, the combined contraceptive pill, spironolactone, and isotretinoin for severe scarring acne.
Is adult acne related to gut health?
There is growing evidence of a gut-skin axis in acne. Gut dysbiosis (imbalanced microbiome) increases systemic inflammation and can worsen acne. People with acne show higher rates of gut permeability and dysbiosis. A diet supporting microbiome diversity (high fibre, fermented foods, low sugar) may reduce acne severity through reduced systemic inflammation, independently of direct hormone effects.
Browse skin condition products at Huncoat Pharmacy. Related: Rosacea Guide, PCOS Guide.
At Huncoat Pharmacy: Avène acne & blemish range, Private prescription acne treatment, Browse acne treatments.