Acne: causes, types and treatment explained

Acne is a common skin condition that develops when pores become blocked with oil and dead cells, allowing bacteria to multiply and inflammation to follow. Understanding this mechanism is the key to handling facial breakouts intelligently, rather than chasing every new product. This guide explains the causes and types of acne, the role of ingredients such as azelaic acid, the truth behind phrases like "the strongest acne medication" and "antibiotics for acne", and how to handle the marks it leaves behind.

The point we always begin with: acne is not the result of poor hygiene. It is an interaction between hormones, oil production and how the skin responds. So it is not solved by harsh scrubbing, but by a considered plan and patience.

What causes acne?

Four main factors combine to produce acne: excess oil (sebum) production, a build-up of dead skin cells inside pores, the overgrowth of certain bacteria, and the resulting inflammation. Hormones play a central role, which is why acne shows up clearly in the teenage years and around the menstrual cycle. Other factors such as stress, the type of skincare products you use and certain medications can worsen the condition without being the original cause.

Recognising that facial breakouts are the result of a connected chain of causes explains why successful treatment targets more than one link in that chain at the same time. A product that only reduces oil, or only clears blockages, addresses a single link and often disappoints, while a plan that tackles oil, blockage, bacteria and inflammation together tends to hold results better over time. This is also why two people with the same visible spots can need very different routines: the balance between those four factors is not identical from one person to the next.

Types of facial acne

Not all facial breakouts are the same, and identifying the type guides the treatment:

Blackheads and whiteheads: non-inflamed blockages inside pores.
Red, inflamed spots: raised bumps, sometimes with a white head.
Under-the-skin bumps: deep, painful lumps with no head.
Cystic acne: large, inflamed nodules that can leave scars.

Knowing where your breakouts fall on this scale determines whether the situation can be managed at home or needs medical input.

Do diet and lifestyle affect acne?

Diet is not the root cause of acne, but for some people certain patterns can make it worse. The clearest signals in the research point to foods with a high glycaemic load — sugary drinks, sweets and heavily refined carbohydrates — which can raise the hormones that drive oil production, and in some individuals to skimmed milk and whey-based supplements. This does not mean everyone needs to change their diet, and cutting out whole food groups without reason is rarely the answer. Stress and poor sleep also influence acne indirectly by shifting hormone levels, while the old idea that greasy or "unclean" food directly causes spots is a myth. A sensible approach is to notice whether a specific pattern reliably worsens your own skin, rather than following restrictive diets in the hope of a cure. For most people, a steady skincare routine matters far more than any single dietary change.

What is the role of azelaic acid in treating acne?

Azelaic acid is a multi-benefit ingredient in acne care: it reduces the bacteria linked to inflammation, calms redness, and helps fade dark post-acne marks. What sets it apart is that it is relatively gentler than some retinoids, so it suits sensitive skin or anyone who cannot tolerate heavy peeling. While azelaic acid is widely available, deciding on the right concentration and how to use it is best guided by a professional, because responses vary.

How do you get rid of acne? A plan with clear priorities

The phrase "get rid of acne" suggests an instant fix, but in reality success rests on complementary pillars that work together. The diagram below shows these five pillars, none of which replaces the others.

flowchart TD
  R[Acne control plan] --> A[Gentle cleansing]
  R --> B[A topical active]
  R --> C[Appropriate moisturising]
  R --> D[Sun protection]
  R --> E[Patience and consistency]

The message is that any missing pillar weakens the whole result. A topical active without moisturising or sun protection can irritate the skin, and a short-lived effort does not give the skin the time it needs to renew. Skin cells turn over across several weeks, so an honest routine is judged over that timescale rather than after a few days. Consistency, in practice, does more than the novelty of any single product — the people who see the steadiest progress are usually the ones who kept a simple routine going rather than switching products every week.

The strongest acne medication: what does that actually mean?

When people search for "the strongest acne medication" they usually mean oral isotretinoin, an effective option for severe acne that resists other treatments. But "strongest" does not mean "right for everyone": this medicine is dispensed by prescription and used under close monitoring because of its side effects and the need for regular tests, and it is not used in pregnancy. Many moderate cases are controlled with simpler topical treatments without needing the strongest options. The decision about which medicine to use rests with a doctor after assessing how severe the case is and your health history.

When is an antibiotic used for acne?

An antibiotic for acne, whether topical or oral, targets bacterial inflammation in moderate to severe cases. The modern treatment principle is that an antibiotic is usually used alongside a topical ingredient such as a retinoid or benzoyl peroxide, and for a limited period to avoid bacterial resistance — not as a permanent standalone treatment. All antibiotics are dispensed by prescription, and using them on your own is never advisable.

Severity level	Description	Usual treatment approach
Mild	Blackheads and scattered spots	Over-the-counter topical ingredients
Moderate	Widespread inflamed spots	Prescribed retinoid or supervised antibiotic
Severe	Cystic acne and scarring	A combined medical plan with follow-up

Acne marks: how do you deal with them?

Once breakouts settle, acne marks sometimes remain as dark or red patches, and these are different from depressed scars that change the skin's texture. Superficial marks usually improve with time, daily sun protection and ingredients such as niacinamide, azelaic acid and topical retinoids. Depressed scars, however, need specialist in-clinic procedures. The golden rule is that the best treatment for marks is preventing new spots first, and not squeezing spots so the marks do not deepen.

Frequently asked questions

What is the strongest medication for acne?

Oral isotretinoin is one of the strongest options for severe, resistant acne, but it is dispensed by prescription and used under close medical supervision because of its side effects and the monitoring it requires. Not every case needs it, and many cases are controlled with simpler topical treatments. Deciding which option is strongest for you is a medical decision, not one to make on your own.

When is an antibiotic prescribed for acne?

An antibiotic is prescribed for moderate to severe inflammatory acne, usually alongside a topical treatment rather than alone, and for a limited period to avoid bacterial resistance. Antibiotics are prescription-only. It is not advisable to use them on your own or for long periods without supervision.

Is azelaic acid helpful for acne and its marks?

Azelaic acid reduces bacteria, calms inflammation and helps fade dark post-acne marks. It suits sensitive skin as a gentler option than some retinoids. The response varies from one person's skin to another, and it is best to have the way you use it guided by a professional.

How do I get rid of acne marks?

Dark or red post-acne marks usually improve with time, sun protection and ingredients such as niacinamide, azelaic acid and retinoids. Depressed scars that change the skin's texture, however, need in-clinic procedures. The most important thing is to prevent new spots first, so marks do not keep forming.

When to see a dermatologist

If your acne is cystic and painful, widespread and resistant to home treatments, or starting to leave marks and scars, these are signs the condition needs a prescribed plan rather than trialling random products. At InJasmine we assess how severe the case is and your skin type before discussing any strong medication or antibiotic, because those options require supervision and follow-up. Starting an assessment early protects your skin from marks that are harder to treat later.