Acne usually starts in the teenage years because that’s when a surge in hormones called androgens kicks the skin’s oil glands into higher gear. More oil, combined with skin cells that shed slightly differently during puberty, makes it easier for pores to clog — and clogged pores are the starting point for most spots.
What actually happens in the skin during puberty?
During puberty, oil glands (also called sebaceous glands) grow larger and become more active than they were in childhood. They start producing noticeably more sebum, the oily substance that normally keeps skin lubricated and protected.
At the same time, the lining of the hair follicle can shed cells in a way that makes them more likely to stick together instead of flowing out onto the skin’s surface. Mix extra oil with cells that aren’t clearing out efficiently, and a pore can become blocked. That blockage is the basic building block of most acne, from small bumps to larger inflamed spots. For a fuller look at the mechanics of a pore, the Acne Basics section covers the process in more detail.
Why do hormones make oil glands more active?
Androgens — a group of hormones that rise during puberty in both boys and girls — attach to receptors on oil glands and effectively tell them to produce more sebum. This isn’t something a person can control by willpower or habits; it’s a normal, expected part of how bodies develop during adolescence.
Androgen levels typically rise earlier and more sharply in boys, which is part of why teenage boys sometimes get more extensive acne on the chest and back, not only the face. Girls also experience an androgen rise during puberty, but the pattern and timing can vary more, partly because of the menstrual cycle layering additional hormonal shifts on top.
It’s worth being clear that having active oil glands is not a sign that something is wrong with a person’s body. It’s an expected, temporary phase of development that most people go through, even though it doesn’t always feel that way in the mirror.
Does everyone get acne as a teenager?
No. Acne during the teenage years is extremely common but not universal, and how much someone gets varies a lot from person to person, even between siblings going through puberty at similar times.
Genetics plays a role in how sensitive someone’s oil glands are to hormonal signals, how quickly their skin sheds cells, and how their skin tends to respond to inflammation. That’s part of why two teenagers with similar routines can end up with very different skin. It also means that acne showing up isn’t a reflection of how carefully someone washes their face or how they eat — it’s closer to a genetic and hormonal lottery than a hygiene report card.
Why does acne appear on some parts of the face and not others?
Acne tends to cluster where oil glands are largest and most densely packed, which is usually the forehead, nose, chin and jawline — sometimes described together as the T-zone — along with the chest, shoulders and back. These areas simply have more oil-producing follicles per square centimetre of skin than places like the eyelids or the backs of the hands, so they’re more prone to the blockages that lead to spots.
Can other things make teenage acne better or worse?
Hormones set the stage, but day-to-day factors can still nudge things in one direction or the other, even if they’re not the root cause. Sleep, stress and general skin routine all get asked about a lot, and the honest answer is that the evidence on most of them is more modest than headlines suggest.
- Stress doesn’t create acne out of nothing, but there’s a reasonable case that it can make existing breakouts feel more active — the piece on stress and skin goes through what’s actually known.
- Sleep quality is sometimes linked to skin looking more reactive, though it’s not a guaranteed fix — covered in more depth on the sleep and skin page.
- Picking, squeezing or over-washing tends to add irritation on top of what hormones are already doing, which is one reason dermatology guidance generally leans toward gentler handling rather than aggressive scrubbing.
None of these are the reason acne starts. They’re more like volume dials on something hormones already switched on. A simple, consistent approach is usually more useful than chasing every possible trigger — the Skincare Routines section has practical starting points for building one.
Why does teenage acne sometimes get worse before it gets better?
Puberty doesn’t move in a straight line, and neither does the acne that comes with it. Hormone levels can spike and settle unevenly over a few years, which is one reason skin can look better for a stretch and then flare again without an obvious cause.
It’s also common for a new active ingredient — a cleanser, a retinoid, an exfoliating acid — to cause some initial dryness, peeling or a short-lived increase in breakouts before things settle. This is sometimes called purging, though it’s genuinely hard to tell apart from a product simply not agreeing with someone’s skin. Introducing one product at a time and giving it several weeks makes that distinction much easier to read.
Does acne always stop after the teenage years?
Not necessarily. For a good number of people, acne fades as hormone levels stabilise into early adulthood, but it doesn’t disappear for everyone on a fixed schedule, and some people develop acne for the first time in their twenties, thirties or later — often with a different pattern, more concentrated around the jawline and lower face. That’s a separate topic worth its own reading, but it’s a reminder that there’s no single age at which skin is guaranteed to settle down.
What can actually help while waiting for hormones to settle?
There’s no way to switch off the hormonal surge behind teenage acne, and no product can promise to do that either. What tends to help is a routine that’s gentle, consistent, and matched to how the skin is actually reacting, rather than one that changes every week.
A dermatologist or GP can also discuss options that go beyond over-the-counter products when acne is more persistent or bothersome, including topical treatments, and in some cases hormonal approaches or oral antibiotics — always with medical supervision, since these come with their own considerations around suitability and monitoring. The page on treatments a doctor might consider for persistent acne lays out what those conversations usually cover, and the piece on hormonal acne treatment explains, in plain terms, who that option tends to suit.
Picking at spots is worth avoiding where possible, not because it’s a moral failing but because it can increase the odds of marks or scarring lasting longer than the spot itself would have — something explored further in the guide on reducing the chance of acne scarring.
When is it worth seeing a doctor about teenage acne?
It’s worth booking an appointment when acne is painful, deep under the skin, leaving marks, spreading, or affecting how someone feels day to day — and seeking that help early is a sensible, ordinary step, not an overreaction. A doctor can also rule out other skin conditions that sometimes get mistaken for acne.
Skin that’s just a few surface spots and skin that’s genuinely affecting someone’s confidence or leaving lasting marks are different situations, and it’s fine to ask for help before things feel unbearable. The guide on when acne is worth seeing a doctor about goes through the signs that make an appointment a good idea, and what tends to happen once someone’s in the room.
Teenage acne is common enough to be considered a normal part of growing up for a lot of people, but common doesn’t mean it has to be ignored, minimised, or gone through without support if it’s genuinely making someone miserable.
Acne Cut publishes general information about skin, not medical advice. We are writers and researchers, not dermatologists, doctors or pharmacists. Acne varies enormously from person to person, and what suits one person’s skin can irritate another’s. If your acne is painful, scarring, getting worse, or affecting how you feel day to day, speak to a doctor or a dermatologist — that is a normal thing to do and it is what they are there for.