Acne vulgaris is the most common skin disorder worldwide, affecting approximately 85% of adolescents and young adults at some point, with a significant proportion persisting into adulthood or first appearing in the adult years. Beyond its physical manifestations — blackheads, whiteheads, papules, pustules, nodules, and cysts — acne carries a substantial psychological burden, contributing to anxiety, depression, and reduced quality of life. The good news is that a wide spectrum of effective treatments exists, from simple topical agents to systemic therapies for severe, scarring disease.
What Causes Acne?
Four interconnected factors drive acne development: (1) excess sebum production stimulated by androgens; (2) follicular hyperkeratinisation — the abnormal accumulation of dead skin cells that plugs pores; (3) colonisation of hair follicles by Cutibacterium acnes (formerly Propionibacterium acnes), which metabolises sebum and triggers inflammation; and (4) inflammation mediated by the innate and adaptive immune response. Genetic susceptibility strongly influences sebaceous gland reactivity to androgens. Common acne aggravators include certain medications (corticosteroids, lithium, anabolic steroids), occlusive cosmetics and sunscreens, stress, and — in women — hormonal fluctuations across the menstrual cycle. Diet-acne relationships are nuanced: high glycaemic-load diets and dairy (particularly skimmed milk) have moderate evidence for acne aggravation in susceptible individuals; chocolate and fried foods have weaker support.
Treatment by Severity
Mild Acne (Comedones and Few Papules)
Topical retinoids (adapalene, tretinoin) normalise follicular keratinisation and are the cornerstone of acne management at all severity levels. Adapalene 0.1% gel is available over the counter in many countries. Topical benzoyl peroxide — available in concentrations of 2.5–10% — is bactericidal against C. acnes without inducing antibiotic resistance and is an essential component of most regimens. Combining a retinoid with benzoyl peroxide addresses multiple pathogenic pathways simultaneously and prevents antibiotic resistance when antibiotics are co-prescribed.
Moderate Acne (Multiple Papules and Pustules)
Adding a topical antibiotic (clindamycin, erythromycin) provides anti-inflammatory and antibacterial activity; always combine with benzoyl peroxide. Oral antibiotics (doxycycline, minocycline, sarecycline) are reserved for moderate-to-severe inflammatory acne. Duration should be limited to 3–6 months to minimise resistance development. In women, combined oral contraceptives (particularly those containing norgestimate, desogestrel, or drospirenone) and spironolactone provide hormonal anti-androgen activity useful for hormonally influenced adult female acne.
Severe and Scarring Acne
Oral isotretinoin (Accutane) is the only treatment that targets all four pathogenic factors simultaneously — typically producing prolonged or permanent remission after a 4–6-month course. Its teratogenicity mandates strict pregnancy prevention in women of childbearing potential. Regular lipid, liver function, and mood monitoring is required during treatment. Despite persistent myths, isotretinoin does not cause inflammatory bowel disease or significantly elevate depression risk in the majority of patients at standard doses.
Frequently Asked Questions
Should I pop or squeeze pimples?
No. Manually rupturing acne lesions damages surrounding skin, pushes bacteria deeper, and dramatically increases the risk of post-inflammatory hyperpigmentation and permanent scarring. If a lesion is particularly painful or prominent, a dermatologist can perform intralesional corticosteroid injection to reduce it rapidly without scarring.
How long does acne treatment take to work?
Topical retinoids typically show initial improvement at 8–12 weeks, with full benefit at 6 months of consistent use. Acne often initially appears to worsen ("retinoid purge") during the first 2–4 weeks before improving. Oral antibiotics produce visible improvement within 4–6 weeks. Setting realistic timelines prevents premature abandonment of effective treatments.
Sources
- Zaenglein AL, et al. Guidelines for the Management of Acne Vulgaris. JAAD. 2016.
- American Academy of Dermatology. Acne clinical guideline. 2023.
- Mayo Clinic. Acne — Diagnosis and treatment. 2023.