Breakouts come down to three things in the pore: oil, dead cells, and skin bacteria.
Behind them sit genes, hormones, stress, diet, and sometimes pore-clogging products.
It's usually several causes at once — and it's not a sign of poor hygiene.
This article is for educational purposes only and is not medical advice. It relates to the appearance and feel of the skin. Consult a dermatologist for persistent, severe, or distressing breakouts.
Breakouts form when three things happen in a pore, often together: excess sebum (oil), a buildup of dead skin cells, and the activity of skin bacteria. Oil and dead cells block the pore, a plug forms, a blemish appears — and bacteria feeding on trapped oil can add inflammation. Behind those mechanisms sit contributing factors: genetics, hormones, stress, diet (for some people), and sometimes pore-clogging cosmetic products. It's usually several at once, not a single cause — which is why breakouts are so common and so individual. One thing they are not: a sign of poor hygiene.
- Breakouts = oil + dead-cell buildup + skin bacteria blocking and inflaming a pore.
- Genetics and hormones are the biggest underlying drivers.
- Stress and, for some, diet can contribute — but they're only part of the picture.
- Some cosmetic products clog pores (comedogenic) — and it's individual.
- Breakouts are not caused by poor hygiene, and over-scrubbing makes them worse.
- For persistent, severe, or distressing breakouts, see a dermatologist.
Breakouts are one of the most common skin concerns there is — and one of the most misunderstood. Beyond how they look, they can affect how you feel, so it helps to understand what's actually going on. The honest answer is that blemishes aren't caused by one thing; they're the result of a few mechanisms in the skin, nudged along by factors like genes and hormones. Here's the science, minus the blame and the myths.
How Breakouts Form
Blemishes are closely tied to the pilosebaceous follicles — the pores where a hair and an oil (sebaceous) gland sit together, concentrated on the forehead, nose, cheeks, and chin. Three processes, often working together, drive a breakout:
- Excess oil (sebum). Over-active oil glands produce more sebum than the pore can clear, so it accumulates and the pore blocks.
- Dead-cell buildup. When skin-cell renewal is sluggish, dead cells accumulate, mix with oil, and help clog the pore.
- Skin bacteria. C. acnes, a bacterium that naturally lives on skin, feeds on trapped oil and can trigger the inflammation behind red, raised blemishes.
Block a pore with oil and dead cells, add bacteria and inflammation, and you get the range of blemishes people recognise — from small bumps to inflamed spots. So what tips the balance toward all this happening? That's where the contributing factors come in.
Genetics
We're not all equally prone to breakouts, and a lot of that is inherited. Genes influence how active your oil glands are, how sensitive they are to hormones, and even your skin's microbiome and inflammatory response. Studies have found a family history is common among people prone to blemishes.
If breakouts run in your family, that's not a personal failing — it's genetics. Understanding this takes some of the frustration (and self-blame) out of the picture, and points toward consistent care rather than blaming yourself.
Hormones
"Hormones are one of the biggest levers on oil production — which is exactly why breakouts spike in adolescence and shift with the menstrual cycle."
Boldpurity Science TeamAndrogen hormones (like testosterone) stimulate the oil glands, so when they rise or fluctuate, oil production increases and breakouts become more likely. This is why they're so common in adolescence, when hormones surge. But puberty isn't the only time: many adults — women especially — notice breakouts shift with the menstrual cycle, pregnancy, or other hormonal changes. This is normal skin biology, not something you've done wrong.
Stress
Stress can influence hormones, which in turn can nudge oil production — so periods of stress can coincide with more breakouts. Some research has found a correlation between stress levels and blemish severity.
It's worth reading this one carefully: the relationship may run both ways — stress might contribute to breakouts, but breakouts can also cause stress. So rather than adding "manage your stress perfectly" to your worry list, treat gentle stress-relief as good for you overall, with any skin benefit as a bonus. Being kind to yourself here helps more than pressure.
Diet
Diet may play a role for some people. High-glycaemic foods, and in some studies dairy, have been linked to breakouts through effects on hormones and oil production. But the evidence is still evolving, the effect varies a lot between individuals, and diet is only one piece of a much bigger picture.
This is general education, not diet advice — and definitely not a cue to cut foods out anxiously or moralise about eating. A balanced, varied way of eating is the sensible approach for your whole body, skin included. If you're concerned about diet and your skin, a doctor or dietitian can give you personalised, healthy guidance.
Cosmetic Products
Sometimes breakouts are triggered by skincare or makeup itself — this is called cosmetic acne, and it happens when a product is comedogenic (pore-clogging) for your skin, usually showing up as small bumps or closed comedones.
The catch is that comedogenicity is individual: a product that breaks one person out is perfectly fine for another, so "non-comedogenic" is a helpful guide, not a cast-iron guarantee. If you suspect a product, patch-test new items and introduce them one at a time so you can spot the culprit.
Contrary to a stubborn misconception, breakouts are not a sign of poor hygiene. They're driven by oil, dead cells, bacteria, genes, and hormones — not by being "unclean". In fact, over-washing and harsh scrubbing make things worse by irritating skin.
Gentle, consistent care beats aggressive cleansing every time. And no matter the cause, if breakouts are persistent, severe, or affecting how you feel, a dermatologist can guide you toward what's right for your skin.
Common Myths
Breakouts are about oil, dead cells, bacteria, genes, and hormones — not hygiene. Over-washing to "fix" them backfires by irritating skin.
Fact: Not a cleanliness issue — and scrubbing harder hurts.
Diet may play a role for some people, but it's individual and only one factor among genes, hormones, and more. Cutting foods anxiously rarely helps.
Fact: Balanced eating beats anxious elimination.
Genetics and hormones are the biggest drivers — largely outside your control. Blame isn't just unfair, it's scientifically wrong.
Fact: Mostly biology, not behaviour.
Frequently Asked Questions
- Dréno, B. et al. Heredity: a prognostic factor for acne. Dermatology (2006).
- Tanghetti, E. et al. The role of inflammation in the pathology of acne. Journal of Clinical and Aesthetic Dermatology (2013).
- Alrahmani, D. et al. The association between stress and acne among female medical students. Clinical, Cosmetic and Investigational Dermatology (2017).
- Dianzani, C. et al. Acne and diet: a review. International Journal of Dermatology (2021).
© 2026 Boldpurity · For educational purposes only · Not to be reproduced without permission.
