Few things feel as personal as your skin, and few things feel as unfair as doing everything "right" and still breaking out. So let's clear something up straight away: acne in your teens is one of the most common, most normal, most hormone-driven things your body does. Around 85% of teenagers get it. It is not a hygiene problem and it is not your fault. Here's what's actually going on.

The hormone behind the breakouts

Puberty turns up a group of hormones called androgens — which includes testosterone, a hormone everyone has, girls included. Androgens send a message to the tiny oil glands in your skin (sebaceous glands) telling them to produce more sebum, the natural oil that lubricates your skin. Testosterone gets converted into an even more potent form called DHT right at those oil glands, which is what really ramps up oil production.

Here's the chain reaction: more oil, plus the dead skin cells your skin naturally sheds, plus normal skin bacteria, equals clogged pores. A clogged pore is the start of a blackhead, whitehead or pimple. That's the whole mechanism, and it's happening because of puberty hormones, not because of anything you did or didn't do.

Sources: Acne (for Teens) — Nemours KidsHealth; and Adolescent acne: association to puberty, testosterone and DHT — PMC, 2025. Puberty androgens (testosterone converted to DHT) drive sebaceous glands to produce more sebum.

Interestingly, estrogen does the opposite — it tends to suppress oil production. So acne is partly a story of androgens pushing oil up while estrogen isn't yet pushing back enough. That balance is exactly what shifts across your cycle, which brings us to the most relatable part.

Is teenage acne hormonal?
Yes. Teenage acne is largely driven by the hormonal changes of puberty. Rising androgens (hormones like testosterone, which everyone has) make the skin's oil glands produce more sebum. That extra oil, combined with dead skin cells and bacteria, clogs pores and creates acne. This is why acne is so common in the teenage years, affecting around 85% of teenagers, and why it is considered a normal part of puberty rather than a sign you are doing anything wrong.

Why it flares right before your period

If your skin reliably gets worse in the week or so before your period, you're not imagining it — this is called premenstrual acne, and it's extremely common. In the days before your period (often about 7 to 10 days before), estrogen drops. Since estrogen is the hormone that helps keep oil production down, its fall means the oil-boosting effect of androgens becomes relatively stronger. More oil, more clogged pores, more breakouts — usually clearing up once your period actually starts and hormones shift again.

Source: Acne (for Teens) — Nemours KidsHealth. Some people get premenstrual acne in the days before their period due to hormone changes.

This is actually one of the most useful things about understanding your cycle: once you know the breakout tends to come at a certain point, it stops feeling random and you can be a little kinder to yourself about it. If your periods are still unpredictable, our guide on irregular teenage periods explains why, and tracking even loosely helps you see your skin's pattern.

Your skin isn't betraying you. It's responding to hormones doing exactly what puberty hormones do, and for most girls, it eases with time.
Why does my acne get worse before my period?
This is called premenstrual acne, and it is very common. In the days before your period (often about 7 to 10 days before), the balance of estrogen and progesterone shifts. Estrogen, which helps keep oil production down, falls, while the effect of androgens becomes relatively stronger. This tends to increase oil production and trigger breakouts that usually clear up once your period begins.

The myths worth letting go of

A few things people say about acne simply aren't true, and believing them mostly just adds guilt:

"You're not washing enough." Acne isn't caused by being dirty. In fact, over-washing or scrubbing hard can irritate your skin and make breakouts worse. Gentle cleansing twice a day is plenty. "It's the chocolate." Chocolate itself isn't a direct cause. Some research does suggest that diets high in high-glycemic foods (sugary snacks, white bread) and, for some people, a lot of dairy can worsen acne, but those are influences, not the root cause — and they're not worth obsessing over. "You'll have it forever." For most people, acne eases significantly by the end of the teenage years as hormones settle.

The two things that genuinely matter most are hormones and genetics. If one or both of your parents had acne as teenagers, you're more likely to as well — which, again, means it's biology, not behaviour.

Source: Teen vs. Adult Acne — Clearview Dermatology; Understanding teen acne — Summer Health. Acne is driven by hormones and genetics, not by being "dirty"; family history is a strong predictor.

Is acne caused by being dirty or eating chocolate?
No. Acne is not caused by being dirty, and over-washing can actually irritate skin and make things worse. Chocolate itself is not a direct cause either. The main drivers are hormones and genetics. Some research links diets high in high-glycemic foods (like sugary snacks and white bread) and, for some people, dairy to worse acne, but these are influences rather than the root cause. If your parents had acne as teens, you are more likely to as well.

Gentle things that help

You don't need a complicated routine. A few sensible basics help most teenage skin: wash gently twice a day with a mild cleanser (no harsh scrubbing), use products labelled "oil-free" or "non-comedogenic" (meaning they don't clog pores), and try not to pick or squeeze — it feels satisfying but can cause scarring and spread inflammation. Over-the-counter products with ingredients like benzoyl peroxide or salicylic acid help many people; give any new product a few weeks before deciding if it works.

And remember the emotional side is real too. Acne can genuinely affect how you feel about yourself, and that matters. You're allowed to take it seriously and to ask for help — it doesn't make you vain.

When to see a doctor or dermatologist

  • Your acne is severe, painful, or cystic (deep, sore lumps under the skin)
  • It isn't improving after a couple of months of gentle over-the-counter care
  • It's affecting your confidence or mood — that's a real and valid reason
  • It's leaving scars or dark marks
  • It comes alongside very irregular periods and extra hair growth on the face or body — this combination can sometimes point to a hormonal condition like PCOS that's worth checking
When should I see a doctor or dermatologist about acne?
It is worth seeing a doctor or dermatologist if your acne is severe, painful or cystic, isn't improving with over-the-counter products, or is affecting your confidence and mood. You should also mention it to a doctor if it comes alongside very irregular periods and extra hair growth, since that combination can sometimes point to a hormonal condition like PCOS that is worth checking.
About the author

Andreea Mighiu is a women's hormonal health educator and the founder of Zōē. She works alongside medical doctors to translate research into clear, friendly education about hormones and the menstrual cycle. She is an educator, not a physician or dermatologist — this article is here to inform and reassure, never to replace advice from your doctor.

References

1. Acne (for Teens). Nemours KidsHealth. kidshealth.org
2. Adolescent acne: association to sex, puberty, testosterone and dihydrotestosterone. PMC, 2025. pmc.ncbi.nlm.nih.gov
3. Understanding teen acne. Summer Health. summerhealth.com
4. Teen vs. Adult Acne: Causes and Treatments. Clearview Dermatology. clearviewdermatology.com

This article is educational and written for general reassurance. It is not medical advice. For persistent, severe or distressing acne, please see a doctor or dermatologist who can recommend the right treatment for your skin.