Acne: What Actually Works
Acne has genuinely well-proven treatments, and you don’t need a 10-step routine to use them. This guide tiers the options by evidence, shows how to combine them without wrecking your skin, and flags when it’s time to stop experimenting and see a dermatologist.
Last reviewed Jun 24, 2026 · Evidence-based — every ingredient links to its underlying studies.
- Benzoyl peroxide for inflammatory (red) acne
- A topical retinoid (adapalene/tretinoin) most nights
- Give it 8–12 weeks; pair with a moisturizer
- Stacking many actives at once — irritation
- Expecting a 10-step routine to beat the basics
- Spending months on cosmetics for cystic/scarring acne
Key point: Benzoyl peroxide + a retinoid is the proven core; see a dermatologist for cystic or scarring acne.
Treatments, by evidence
- 9Benzoyl peroxide— Kills C. acnes, anti-inflammatory; the workhorse for inflammatory acne
- 9Adapalene— OTC topical retinoid; unclogs pores, strong evidence, stable with benzoyl peroxide
- 8Tretinoin— Prescription retinoid; gold standard for comedonal + inflammatory acne
- 5Salicylic acid— Pore-penetrating BHA; best for blackheads/whiteheads
- 7.5Azelaic acid— Gentle multitasker — acne, redness, and post-acne marks
- 6Niacinamide— Calms inflammation and oil; very well tolerated
- 5Tea tree oil— In one small, dated trial it worked more slowly and somewhat less than benzoyl peroxide; allergic-reaction risk
- 4Green tea / EGCG— Antioxidant + sebum/anti-C.acnes signal; adjunctive
- 8.5Zinc (oral)— Modest evidence, mainly where intake is low
- Oral antibiotics— Short courses (≈3–4 months) for inflammatory acne — always paired with benzoyl peroxide and never as monotherapy, to limit antibiotic resistance
- Isotretinoin— The most effective treatment for severe/scarring/cystic acne — but a potent teratogen: strict pregnancy prevention is mandatory, plus mood/lab monitoring. Prescription only
- Hormonal therapy— Combined oral contraceptives or spironolactone for hormonal acne in women (spironolactone is typically taken with contraception)
Evidence at a glance
Acne options ranked by their own evidence score (0–10).
Combine without wrecking your skin
Benzoyl peroxide + adapalene is a proven, often co-formulated combination. But don’t stack too many actives at once — irritation, not "the wrong product", is the usual reason routines fail. Introduce one thing at a time, give it 8–12 weeks, and use a moisturizer. See the layering guide for what to keep apart (e.g. don’t pile retinoids and exfoliating acids on the same night).
When to see a dermatologist
If you have deep, painful, cystic or nodular acne, or it’s leaving scars, don’t spend months on cosmetics — that’s when prescription treatment (especially isotretinoin) is warranted. Early treatment prevents permanent scarring. Note isotretinoin is a potent teratogen, so anyone who could become pregnant must use strict pregnancy prevention while on it.
Sources & further reading
The curated, PubMed-verified studies behind each option live on its page.
Common questions
Benzoyl peroxide or salicylic acid — which should I use?
Benzoyl peroxide is better for inflammatory (red, pus-filled) acne because it kills C. acnes; salicylic acid is better for comedonal acne (blackheads/whiteheads) because it penetrates and clears pores. Many people use both, at different times.
Does diet cause acne?
The evidence is modest: high-glycemic diets and possibly skim dairy are weakly linked to acne in some people, but diet is not the main driver for most. Proven topicals matter far more than cutting foods.
Does tea tree oil actually work?
Modestly — small, dated trials show it reduces acne lesions, but in the head-to-head it worked more slowly and somewhat less than benzoyl peroxide, and it can cause allergic reactions. A reasonable gentle option, not a first-line replacement.
How long until acne treatments work?
Give most topicals 8–12 weeks of consistent use before judging them. Acne often looks worse in the first few weeks ("purging") with retinoids — that’s expected, not a reason to stop.
Educational guidance, not medical advice. Evidence and safety details for each option live on its individual page; see a clinician for prescription treatments or persistent problems.
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