The Truth About Acne: What Actually Causes Breakouts and What Genuinely Helps
Acne is one of the most common skin conditions in the world. Yet it’s also one of the most misunderstood — there are more myths, miracle cures, and misinformation floating around acne than almost any other skin concern.
Let’s cut through the noise.
What Acne Actually Is
Acne is a condition of the pilosebaceous unit — the hair follicle and its associated sebaceous gland. The four known causes of acne are: excess sebum production, a build-up of dead skin cells inside the follicle, the presence of the bacteria Cutibacterium acnes, and inflammation.
Hormones are a primary driver, which is why acne peaks in adolescence when androgens surge — but it also explains why adult acne is so common, particularly in women, where hormonal fluctuations throughout the menstrual cycle, pregnancy, perimenopause, and conditions like PCOS all affect sebum production.
Acne isn’t caused by dirty skin. Over-cleansing or using harsh products can actually make acne worse by stripping the skin, triggering more oil production, and disrupting the skin barrier.
Ingredients That Genuinely Work for Acne
The skincare market is full of acne products making big claims. These are the ingredients that actually have good evidence behind them:
Salicylic acid (BHA): Oil-soluble, which means it can penetrate inside the pore to dissolve the dead skin cells and sebum that cause congestion. Ideal for blackheads, whiteheads, and bumpy texture. Use in a cleanser or leave-on toner at 0.5–2%.
Benzoyl peroxide: Works by killing acne-causing bacteria and reducing inflammation. Very effective for inflammatory acne (red, angry spots). Start at 2.5% to minimise irritation and dryness. Don’t use alongside retinoids at the same time.
Niacinamide: Regulates sebum production, reduces redness and inflammation, and helps fade the post-acne marks left behind. It’s also gentle enough for daily use on reactive skin. 5–10% is effective.
Azelaic acid: A brilliant multi-tasker. It tackles acne-causing bacteria, reduces inflammation, and simultaneously helps fade pigmentation. Safe during pregnancy, which makes it one of very few actives suitable for acne during that time. 10–20% is the therapeutic range.
Retinoids: Speed up cell turnover to prevent the dead skin cell build-up that blocks pores, while also reducing inflammation. One of the most well-evidenced acne treatments available. Prescription-strength tretinoin is more powerful; over-the-counter retinol or retinaldehyde are good starting points.
Adapalene: A retinoid available over the counter in the UK and many other countries. Specifically formulated for acne, with good tolerance and a strong evidence base.
What to Avoid When You Have Acne
Harsh physical scrubs: Scrubbing acne can spread bacteria, cause micro-tears in the skin, and worsen inflammation. They don’t exfoliate inside the pore where the problem actually is. Stick to chemical exfoliants.
Heavy, pore-clogging products: Look for products labelled non-comedogenic if you’re prone to breakouts. Thick oils like coconut oil and products with a high concentration of certain waxes can block pores and trigger new breakouts.
Fragrance and alcohol: Both can irritate and inflame acne-prone skin. Check your ingredients lists and opt for fragrance-free formulas wherever possible.
Over-treating: Layering multiple acne actives on top of each other, or using every product at maximum strength, is one of the fastest ways to destroy your skin barrier and make acne worse. Start with one active, give it time, and build from there.
The Dark Marks Acne Leaves Behind
Post-inflammatory hyperpigmentation (PIH) — the flat dark marks left after a spot heals — is one of the most frustrating parts of acne for many people. It’s not scarring; it’s excess melanin deposited during the healing process.
The most important thing to know: you cannot fade PIH effectively while you’re still getting new spots. Every new breakout creates a new dark mark. Treating the acne first is always the priority.
Once active acne is managed, PIH responds well to a combination of consistent SPF (sun exposure makes it significantly darker and slower to fade), azelaic acid, niacinamide, vitamin C, and alpha arbutin. Results take time — expect 3–6 months of consistent use before seeing significant improvement.
Prescription Medications For Acne
OTC products work well for mild to moderate acne, but if you have persistent, painful, cystic, or nodular acne that isn’t responding to over-the-counter treatment after 2–3 months, please see your GP or a dermatologist. Prescription options including topical tretinoin, antibiotic gels, combined oral contraceptives, or — for severe cases — oral isotretinoin can be genuinely transformative.
Acne is a medical condition, not a moral failing or a hygiene problem. There is effective help available. Don’t suffer in silence or spend years cycling through products that aren’t strong enough to address what’s actually going on.