common-causes-of-adult-acne-and-how-to-treat-it

When we think about acne, we commonly think about our teenage selves. However, it is really important to remember that many people in their 20s, 30s, 40s and beyond still experience acne. It is very normal for all humans to develop the odd blemish or pimple at some point.

If you are dealing with adult acne, in this article we will discuss what causes adult acne and how to treat it effectively here at Thames Skin Clinic. Our founder, Dr Anna Hemming, is a leading UK expert in advanced laser treatments for acne.

What Is Adult Acne and Why Does It Happen?

Adult acne is persistent or new-onset acne that occurs after the age of 25. It is quite common to see acne persist into adulthood. It is also common for many people to experience acne for the first time in adult life, even though they never had it as a teenager.

is just the medical word for spots, and it can take multiple forms. It can appear as blackheads or whiteheads, small bumps underneath the skin, red bumps, or deeper lesions that don’t come to a head, known as nodules or cysts. For the most part, the same factors that cause acne in our teenage years are similar in adult acne.

Adult acne can also have a significant psychological impact on our confidence, especially at work and in day-to-day life. Also, around 20% of people with acne may develop scarring.

What Are the Most Common Causes of Adult Acne?

Adult acne has a number of causes, but it ultimately comes down to a complex interaction between hormones and genetics. In both men and women, testosterone can increase oil (sebum) production, which makes the skin more prone to blocked pores and acne breakouts.

These hormones act on the oil glands in the skin, making them larger and more active. When oil production increases, pores are more likely to become blocked. Once blocked, bacteria can contribute to inflammation, leading to deeper red spots and acne.

The key takeaway is that adult acne is multifactorial. Hormones, diet, stress, genetics, obesity, pollution, skincare habits and modern environment all contribute to the causes of adult acne.

Adult acne affects a significant number of UK women, with up to 54% of women over 25 experience some form of it. So it is no longer thought of as just a teenage condition.

In women, acne is closely tied to hormonal fluctuations throughout life. When the balance between female hormones (oestrogen and progesterone) and testosterone shifts, oil production can increase, triggering breakouts. These fluctuations can happen at several points, including:

Menstrual cycle – changing oestrogen and progesterone levels in the days before a period are a common trigger for monthly breakouts.

Pregnancy – particularly during the first trimester, when hormone levels rise rapidly

Breastfeeding – hormonal shifts after birth can continue to affect the skin.

Contraception changes – starting, stopping or switching hormonal contraception can disrupt the skin’s balance.

Perimenopause and menopause – as oestrogen levels decline, testosterone can become more dominant, leading to increased oil production and acne.

Because these triggers are ongoing throughout a woman’s life rather than a single event, adult acne in women can be persistent. Therefore, it is best managed with a long-term treatment plan rather than a short-term fix.

Another overlooked cause of adult acne in women is PCOS.

Polycystic Ovary Syndrome (PCOS) is a hormonal condition affecting approximately 1 in 10 UK women, and is one of the most common underlying medical causes of persistent adult acne in women. Elevated androgen levels associated with PCOS increase sebum production and can cause deep, cystic acne particularly along the jawline and chin. Because this type of acne is driven by an internal hormonal imbalance, it rarely responds well to standard over-the-counter products alone.

At , Dr Anna Hemming is experienced in identifying and treating acne with a potential hormonal root cause. If your acne is persistent, cyclical and accompanied by other symptoms such as irregular periods, excess hair growth or weight changes, we will factor this into your personalised treatment plan from your very first consultation.

We work closely alongside your GP where appropriate, ensuring that both the underlying cause and the skin itself are being addressed together. For PCOS-related acne, a combination of medical-grade skincare, AviClear and targeted in-clinic treatments can deliver significant, lasting improvement even when other approaches have failed.

Male adult acne is primarily caused by changes in the hair follicle and oil glands, with hormones being the main contributor.

In adult men, testosterone and its more active form (DHT) increase oil production in the skin. This excess oil blocks pores, allowing bacteria and inflammation to develop and then acne breakouts.

Common causes of male acne include:

Other causes of adult acne in men include lifestyle and medical factors. Testosterone therapy, anabolic steroids, stress, smoking and certain dietary patterns may all influence how severe breakouts become in some men.

In some cases, other factors can make acne worse in men or mimic it entirely, which is why correct diagnosis is important. Some conditions in men can look like acne, such as rosacea or shaving-related irritation and razor bumps (pseudofolliculitis barbae).

Modern life also plays a significant role in adult acne. Stress increases cortisol levels, which can affect skin turnover, pH balance and oil production. Cortisol can increase oil production and inflammation while slowing healing. Chronic stress, poor sleep and lifestyle pressures can worsen acne and create a cycle where acne itself becomes stressful, further perpetuating the problem.

Managing stress through techniques such as yoga, meditation, regular exercise and good sleep hygiene can therefore be a meaningful part of any acne management plan.

Modern diets have shifted towards ultra-processed foods, which may contribute to an overall inflammatory load in the body. Dairy appears to affect a small minority of individuals, with low-fat dairy potentially having more of an impact than full-fat dairy. However, for most people, cutting out dairy is unlikely to make a significant difference.

Foods or with a high glycaemic index may also contribute, as they can raise insulin and insulin-like growth factor 1 (IGF-1), which in turn increases oil production. The key is not necessarily eliminating sugar entirely but moderating intake and maintaining a healthy, balanced diet rich in fruit, vegetables, whole grains and lean protein. Staying well hydrated throughout the day also supports overall skin health.

Yes, the wrong skincare products can absolutely trigger or worsen acne. Products that contain heavy oils, occlusive ingredients or comedogenic (pore-blocking) compounds can trap sebum and dead skin cells inside the follicle, leading to congestion and breakouts.

This is sometimes referred to as "acne cosmetica". This is acne caused or aggravated by cosmetics. It can be a particular issue with thick foundations, heavy moisturisers, or hair products that come into contact with the forehead and hairline. Always look for products labelled ‘non-comedogenic’ and ‘oil-free’ and be sure to remove all makeup thoroughly before bed.

Genetics do play a role in adult acne. If one or both of your parents had significant acne, you are more likely to experience it yourself. Genetic factors can influence how large and active your sebaceous (oil) glands are, how your immune system responds to acne-causing bacteria and how quickly your skin cells turn over.

While you cannot change your genetic predisposition, understanding it can help set realistic expectations for treatment. Acne with a strong genetic component can often still be managed very effectively with the right combination of professional and at-home treatments.

A number of everyday lifestyle habits can make adult acne worse. Touching your face frequently transfers bacteria and oils from your hands to your skin. Resting your face against your phone screen, dirty pillowcases or towels can introduce bacteria to the skin.

Smoking, excessive alcohol consumption and a lack of sleep can all impair the skin’s ability to heal and renew itself and contribute to acne. Healthy lifestyle habits include:

The lifestyle habits can all have a positive impact on acne-prone skin.

How Can You Treat Adult Acne Effectively?

Adult acne should always be treated as an individual condition, as there is no one-size-fits-all approach. It can be a chronic condition that is managed rather than permanently cured. Seeking early treatment is important, as delaying care can increase the risk of scarring.

When it comes to managing adult acne, there are several skincare ingredients that can help, including

If you are using active ingredients, it is important to wear , ideally factor 30 to 50, as some treatments can increase sun sensitivity.

A common misconception is that acne-prone skin does not need moisturiser, but hydration is still essential. Using non-comedogenic moisturisers can help maintain the skin barrier without clogging pores.

While skincare can help with pigmentation and marks, true scarring that causes indentations in the skin usually requires professional treatments such as lasers or peels.

You should consider seeing a skin specialist for adult acne if

At , Dr Anna Hemming and her experienced team specialise in adult acne treatments. We offer personalised, doctor-led acne treatment plans for persistent congestion all the way through to cystic acne and scarring.

What Professional Treatments Work for Adult Acne?

Adult acne often needs a combination approach that treats both the active breakouts and the underlying causes. At Thames Skin Clinic, we tailor adult acne treatment plans based on skin type and severity, ranging from topical care to advanced laser and medical treatments.

is the world’s first 1726nm laser specifically developed to treat acne at its source. It is FDA-cleared for mild to severe inflammatory acne vulgaris. It is suitable for all skin tones and types — including darker skin that cannot safely be treated with many other laser systems. Rather than treating the surface of the skin, AviClear targets and selectively suppresses the sebaceous glands responsible for excess oil production, reducing breakouts from the inside out.

A course of three treatments is carried out one month apart. Clinical data shows that 90% of patients saw a visible improvement six months after completing their course, rising to 92% at twelve months. AviClear is the only acne laser to demonstrate this level of sustained, long-term improvement with no prescription medication required. The integrated AviCool

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