Adult acne: causes and what actually works

Adult acne is more common than most people expect, and it tends to be more frustrating than teenage acne because it doesn't follow the same rules. The products that worked at 16 don't work at 32. It often clusters around the jaw and chin rather than the forehead. It correlates with stress, with hormonal fluctuations, with what you ate last week. It's less predictable, and the mainstream advice - cleanse more, moisturise less, try this new ingredient - frequently misses the point.

Understanding why adult acne behaves differently, and what's actually driving it, tends to produce better results than another round of topical products.

Adult acne is rarely just a skin problem. It's usually a signal from the body about something happening internally - and addressing it topically alone rarely produces lasting results.

Why adult acne is different

Teenage acne is primarily driven by the surge in androgens during puberty, which increases sebum production across the whole face. Adult acne tends to be more hormonally complex - driven by fluctuations rather than surges, and concentrated in the lower face where the sebaceous glands are most androgen-sensitive. This is why adult breakouts tend to be deeper, more cystic, and more closely tied to hormonal events like the menstrual cycle, stress, or changes in contraception.

Sebum production is regulated by androgens including testosterone and DHT. When androgen activity is elevated - whether from hormonal fluctuation, insulin spikes, or increased stress - sebum production increases. Combined with a build-up of dead skin cells in the follicle, this creates the conditions for acne bacteria to proliferate and inflammation to follow.

Hormones and the cycle connection

For women, acne that worsens in the week before a period is a classic pattern driven by the drop in oestrogen and relative dominance of progesterone in that phase, which increases sebum production and follicular cell turnover. Acne that persists throughout the cycle may point to underlying androgen excess or insulin resistance, which is worth discussing with a GP if it's significant.

Stress-driven acne operates through a similar pathway. Cortisol stimulates sebum production directly, and also elevates androgens as a secondary effect. This is why breakouts reliably follow stressful periods - it's not a coincidence or sensitivity, it's a hormonal mechanism. Managing the stress response over time, not just on bad days, tends to have a more lasting effect on stress-driven acne than any topical intervention.

Diet, blood sugar and hormonal acne

The evidence linking high-glycaemic diets to acne has strengthened considerably over the past decade. Rapid blood sugar spikes from refined carbohydrates and sugar increase insulin and IGF-1, a growth factor that stimulates sebum production and androgen activity. Several randomised controlled trials have shown that switching to a lower-glycaemic diet produces significant reductions in acne lesion count, independent of any skincare changes.

Dairy is a more individual trigger. It contains hormones and bioactive compounds that can stimulate IGF-1, and some people find a clear correlation between dairy intake and breakouts. The relationship isn't universal, but it's common enough to be worth testing with a short elimination if acne is persistent and unexplained.

The gut connection is also significant. A disrupted gut microbiome generates systemic inflammation that frequently manifests on the skin, and gut bacteria also influence hormone metabolism - including androgen processing. People with persistent adult acne who haven't explored the gut angle often find it the most productive direction. This is covered in more depth in the gut-skin connection article, but the short version is: diet quality and microbiome health are central to the acne conversation in a way that skincare marketing never acknowledges.

Oxidative stress and skin inflammation

One mechanism in acne that's less discussed is oxidative stress - an imbalance between free radicals and the antioxidants that neutralise them. Research has found elevated oxidative stress markers in people with acne, and sebum that's high in oxidised lipids is particularly prone to triggering inflammation. Antioxidant status matters.

Vitamin C is the skin's primary water-soluble antioxidant and also essential for collagen production. Zinc, while NQ doesn't currently carry it as a standalone, is worth mentioning because the evidence for its role in acne is strong - it inhibits androgen activity at the sebaceous gland level and has anti-inflammatory effects. Omega-3 fatty acids shift the balance of inflammatory to anti-inflammatory eicosanoids in the skin - people with higher omega-3 intake consistently show lower rates of inflammatory acne. Pure Pure Pure Pure Pure Pure Pure Pure Pure Pure Pure Pure Pure Pure Pure Pure Pure Pure Pure Pure Krill Oil, with its phospholipid-bound omega-3s and astaxanthin (a potent antioxidant), addresses both the inflammatory and oxidative stress components.

What actually helps

Topical treatment has a role - salicylic acid, benzoyl peroxide, and retinoids all have genuine evidence for acne. But if you're relying on them without addressing the internal drivers, you're managing symptoms rather than causes. Most people with persistent adult acne need both.

Diet is probably the highest-leverage internal change. Reducing refined carbohydrates and sugar, eating more vegetables and fibre, and limiting alcohol all reduce the hormonal and inflammatory drivers of acne. Testing dairy as a variable is worth doing if you haven't - two to four weeks without it is enough time to see whether it's a factor for you.

Stress management is underrated in the acne conversation. Cortisol's effect on sebum and androgens is direct and well-established - consistent stress reduction over weeks produces noticeable skin changes that no amount of spot treatment achieves. Sleep matters for the same reason - poor sleep elevates cortisol and impairs the overnight skin repair that reduces inflammation.

For supplementation, omega-3s are the most broadly applicable - they reduce the systemic inflammatory load that contributes to acne regardless of the specific driver. A high-quality probiotic is valuable if gut health is a factor. Vitamin C supports both the antioxidant defence in the skin and the collagen repair that reduces post-acne scarring. These aren't substitutes for the dietary and lifestyle changes - they're useful additions once those foundations are in place.