What causes adult acne?
Adult acne is usually driven by hormones, not poor hygiene. Shifts in oestrogen, progesterone and androgens prompt the skin to make more oil, which mixes with dead cells and acne bacteria and blocks the pore. Stress, some medications, skincare that is too rich and genetics all add to the picture.
If you are breaking out in your late twenties, thirties or forties, you are in good company. So many of the clients we see at our clinic in St Marys assumed acne was something they would leave behind in their teens, then found it turning up along the jaw and chin years later. Understanding what causes adult acne is the first step to calming it, and it is worth reading our complete guide to adult acne alongside this piece.
Hormones: the main driver
Hormones are the single biggest reason adult acne appears, especially the deeper, tender kind along the lower face. Androgens (including testosterone, which everyone has) tell the oil glands to work harder. When oil production rises, pores clog more easily and breakouts follow.
This is why so much adult acne flares in a monthly pattern, in the week before a period, during pregnancy, around perimenopause, or when starting or stopping hormonal contraception. Conditions such as polycystic ovary syndrome (PCOS) can also keep androgens elevated, so persistent acne alongside irregular cycles or excess hair growth is worth raising with your GP.
What else feeds a breakout
Hormones set the stage, but several everyday factors decide how often and how badly the skin reacts. None of these mean you have done something wrong; skin is simply responsive.
- Stress. Raised cortisol nudges oil glands to produce more, which is why deadlines and poor sleep often show up on your face.
- A compromised barrier. Over-cleansing and harsh scrubbing strip the skin, so it overproduces oil to compensate and becomes inflamed.
- The wrong products. Rich creams and heavy makeup can block pores in skin that is already oily.
- Medications. Some steroids and other prescriptions list acne as a side effect.
- Genetics. If acne runs in your family, your skin may simply be more prone to it.
- Diet, for some people. High-sugar, high-dairy patterns can be a trigger for certain skin, though this varies a great deal.
How adult acne differs from teenage acne
Adult acne tends to be less widespread but more stubborn than the teenage kind. It usually settles along the jaw, chin and neck rather than across the forehead, and often shows up as deeper, inflamed bumps that take longer to clear. Adult skin is also drier and more reactive, so the strong, drying products marketed at teenagers often make things worse.
| Feature | Teenage acne | Adult acne |
|---|---|---|
| Main location | Forehead, nose, cheeks | Jaw, chin, neck |
| Typical driver | Puberty hormones | Hormonal shifts, stress, barrier |
| Skin tends to be | Oilier overall | Drier and more reactive |
| Best approach | Oil control | Calm, balance and support the barrier |
What a considered approach looks like
Take a client in her mid-thirties who comes in frustrated by tender breakouts along her jaw that arrive like clockwork before each period. She has been scrubbing twice a day and layering strong spot treatments, and her skin is now red and sensitive as well as breaking out. In a consultation we would look at the whole picture, ease back the harsh routine, and focus first on settling the inflammation and rebuilding the barrier before doing anything more active.
From there, a plan might combine gentle in-clinic pHformula skin resurfacing to help refine the skin and clear congestion, alongside LED light therapy to calm inflammation. pHformula is controlled resurfacing, not a peel, and every plan is built around your skin rather than a fixed menu. Results vary from person to person, which is exactly why we start with a proper chat about your skin and your cycle.
The short version: adult acne is mostly hormonal, made worse by stress, a stripped barrier and the wrong products, and it responds best to a calm, personalised plan rather than harsh quick fixes.
Frequently asked questions
Why am I getting acne in my 30s when I never had it as a teenager?
Adult-onset acne is common and usually hormonal. Fluctuations in your cycle, stress, contraception changes or conditions like PCOS can raise oil production for the first time in adulthood, even if your teenage skin was clear.
Is hormonal acne always along the jaw and chin?
Often, but not always. Hormonal acne classically settles on the lower face, jaw, chin and neck, yet it can appear on the cheeks too. The tell-tale sign is a monthly pattern that flares before your period.
Does what I eat cause adult acne?
For some people diet is a trigger, though it is rarely the whole story. High-sugar and high-dairy patterns can worsen breakouts in certain skin, so it is worth noticing your own patterns rather than cutting foods drastically.
Can skin treatments help with hormonal breakouts?
They can help manage and calm the skin, though they work alongside your overall health rather than replacing medical care. Treatments are designed to reduce congestion and inflammation and support the barrier. Results vary, so we always begin with a consultation.
When should I see a doctor about adult acne?
See your GP if acne is severe, scarring, or paired with irregular periods or excess hair growth, as this may point to a hormonal cause worth investigating. We are always happy to work alongside your doctor.
Not sure where to start with your skin? You are warmly welcome to book a consultation with Ann, Kirstie or Linda, and we will take the time to understand your skin before building a plan that genuinely suits you. If you would like to read more first, our explainer on pHformula resurfacing is a good next step.
