Acne is often dismissed as an expected rite of adolescence – something to endure rather than treat. This dismissal does real harm. Moderate-to-severe acne causes scarring, and scars are permanent. The psychological impact of visible acne on a teenager's face, chest, or back during the years when identity and peer relationships matter most is significant and well-documented. It is not vanity.
The good news is that acne treatment has improved substantially and that most cases respond to treatment that is available in the UK without a specialist referral. The challenge is knowing which treatment to use, since the skincare market is saturated with products that range from genuinely useful to completely ineffective, and the information reaching teenagers via social media is unreliable.
Healthbooq (healthbooq.com/apps/healthbooq-kids) covers adolescent health and skin conditions.
How Acne Develops
Four factors interact to produce acne lesions. Sebaceous glands (oil glands attached to hair follicles) enlarge under the influence of androgens during puberty, producing more sebum. The follicular lining sheds cells that clump together and mix with sebum, blocking the follicle. Cutibacterium acnes (formerly Propionibacterium acnes) bacteria colonise the blocked follicle and provoke an inflammatory response. The inflammation produces the red, painful spots of inflammatory acne; blocked follicles without inflammation produce comedones (blackheads and whiteheads).
Diet and face-washing do not cause acne in any meaningful sense. Skin hygiene is relevant only insofar as very harsh washing or scrubbing worsens inflammation. High-glycaemic-index diets and dairy consumption have weak associations with acne severity in some studies, but neither is a significant driver compared to the hormonal and follicular factors.
Types of Acne Lesions
Comedones are non-inflammatory lesions. Closed comedones (whiteheads) are blocked follicles with a white surface. Open comedones (blackheads) are oxidised plugs visible at the follicle opening – the colour is oxidised sebum, not dirt. Papules are small raised red spots. Pustules are papules with visible pus. Nodules are larger (>5mm), deeper, painful, firm lumps. Cysts are larger fluid-filled lesions. Nodular-cystic acne is severe, painful, and at high risk of scarring.
What Actually Works
Benzoyl peroxide (BPO) is the most evidence-backed over-the-counter treatment. It kills C. acnes bacteria, reduces sebum, and has comedolytic (unblocking) effects. It is available in 2.5-10% concentrations: start at 2.5-5% to minimise dryness and irritation, use once daily, and increase gradually. It bleaches fabric. It is genuinely effective and works within 4-8 weeks of consistent use.
Topical retinoids (adapalene, available over the counter in 0.1%; tretinoin on prescription) reduce follicular keratinisation – the cell-clumping that blocks the follicle. They work on both comedonal and inflammatory acne. They cause initial dryness and irritation, and must be used regularly at night for 3-4 months to see full benefit. Adapalene 0.1% gel is one of the most effective over-the-counter acne treatments available and is underused because the initial irritation discourages people before benefit appears.
The combination of BPO (morning) + topical retinoid (evening) is the evidence-based, non-prescription first-line approach for mild-to-moderate acne.
Topical antibiotics (clindamycin, erythromycin) reduce C. acnes but should always be used in combination with BPO to prevent antibiotic resistance. They are available on prescription. NICE guideline NG198 strongly advises against topical antibiotic monotherapy.
When to See a GP
Moderate-to-severe acne (widespread papules and pustules, nodules, scarring, or significant psychological distress) warrants a GP assessment. The NICE guideline recommends:
Oral antibiotics (lymecycline, doxycycline, oxytetracycline) for moderate acne, combined with a topical retinoid and BPO. Oral antibiotics must not be prescribed without a topical BPO in the same regimen (resistance prevention). A 3-month course is tried; if no response, second-line or referral.
Combined oral contraceptive pill in girls: certain COCPs (co-cyprindiol, Yasmin) have anti-androgenic effects and are effective for acne. They are often underused in the discussion of acne treatment.
Isotretinoin (Roaccutane) is an oral retinoid and the most effective acne treatment available. It is prescribed only by or after referral to a dermatologist, requires monthly monitoring, and carries significant risks including severe teratogenicity (a mandatory pregnancy prevention programme is required for all girls and women of childbearing potential under the MHRA's Pregnancy Prevention Programme), dry skin and mucous membranes, and, in a small number of patients, mood changes (the evidence on depression is less clear-cut than media coverage suggests, but mood monitoring is standard). For severe, scarring acne, isotretinoin is often the difference between clear skin and permanent scarring.
The Psychological Impact
Research by Andrew Thompson (University of Sheffield) and others has documented that acne severity correlates with rates of depression, anxiety, and suicidal ideation in teenagers. The correlation is not fully explained by the severity of acne: even mild acne causes significant psychological distress in some young people, while others with severe acne cope well. Acknowledging the psychological dimension – rather than dismissing it as teenagers being oversensitive – is part of good clinical care.
A teenager whose acne is causing significant psychological distress warrants faster escalation to treatment, not reassurance that it will clear up eventually.
Key Takeaways
Acne affects around 85% of teenagers at some point, making it the most common skin condition of adolescence. It is caused by the interaction of sebum production, Cutibacterium acnes bacteria, follicular keratinisation, and inflammation – not by poor diet or inadequate face-washing. Mild-to-moderate acne responds well to topical treatments: benzoyl peroxide, topical retinoids, and topical antibiotics (ideally combined with benzoyl peroxide to prevent antibiotic resistance). Moderate-to-severe acne warrants GP assessment for oral antibiotics, combined oral contraceptive (in girls), or referral for isotretinoin. Early treatment prevents scarring. Acne has significant psychological impacts that are frequently underestimated by clinicians and parents.
