Also known as: Acne Vulgaris
Acne occurs when hair follicles become clogged with oil and dead skin cells.
Acne vulgaris is the most common skin condition worldwide, affecting approximately 85% of people between the ages of 12 and 24. While often considered a teenage affliction, acne can persist into or first appear in adulthood, with adult acne affecting up to 15% of women and 5% of men. Acne develops when hair follicles (pores) become clogged with a combination of excess sebum (oil) produced by the sebaceous glands and dead skin cells that fail to shed properly. This creates an environment conducive to the proliferation of Cutibacterium acnes (formerly Propionibacterium acnes), a bacterium that naturally resides on the skin but can trigger inflammation when trapped within blocked pores.
Four key factors contribute to acne development: excess sebum production (often driven by androgens), abnormal keratinization (irregular shedding of skin cells within the follicle), bacterial colonization, and inflammation. Hormonal fluctuations during puberty, menstruation, pregnancy, and polycystic ovary syndrome (PCOS) are major drivers, as androgens stimulate sebaceous gland activity. Genetic predisposition plays a significant role, with family history being one of the strongest predictors of acne severity. Other contributing factors include certain medications (corticosteroids, lithium, androgen-containing hormonal therapies), occlusive cosmetics, mechanical friction, and potentially dietary factors.
Acne manifests in several forms, ranging from mild comedonal acne (blackheads and whiteheads) to severe nodulocystic acne (deep, painful, inflammatory lesions). The condition most commonly affects the face, but can also involve the chest, back, and shoulders — areas with the highest concentration of sebaceous glands. Beyond the physical symptoms, acne carries a substantial psychological burden. Studies consistently show that acne is associated with reduced self-esteem, social anxiety, depression, and impaired quality of life. Effective treatments are available for all severities of acne, and early, appropriate intervention can prevent scarring and minimize psychological impact.
People with Acne often experience the following symptoms.
Comedones are the primary lesion of acne. Open comedones (blackheads) appear as small, dark spots on the skin surface — the dark color results from oxidation of melanin, not dirt. Closed comedones (whiteheads) are small, flesh-colored or white bumps beneath the skin surface where the pore opening remains closed.
Papules are small, raised, solid bumps that are red, tender, and inflamed. They develop when the wall of a clogged pore breaks down from inflammation, allowing bacteria and cellular debris to enter surrounding tissue. Papules do not contain visible pus and should not be squeezed.
Pustules are similar to papules but contain visible pus (a white or yellowish center). They appear as red bumps with a white or yellow tip. Despite the temptation, popping pustules can spread bacteria, worsen inflammation, and increase the risk of scarring.
Nodules are large, hard, painful lumps deep beneath the skin surface. They develop when clogged, infected pores cause deeper tissue damage. Nodular acne is considered severe and typically requires prescription treatment, as over-the-counter products cannot penetrate deep enough to be effective.
Cysts are the most severe form of acne lesion — large, soft, painful, pus-filled lumps deep under the skin. They carry the highest risk of permanent scarring. Cystic acne often requires aggressive treatment including isotretinoin or intralesional corticosteroid injections.
Excess oil production gives the skin a shiny, greasy appearance, particularly in the T-zone (forehead, nose, and chin). Oily skin is both a contributing factor to acne and a visible accompanying symptom, often requiring specific skincare approaches.
After acne lesions heal, dark marks (post-inflammatory hyperpigmentation) or reddish spots (post-inflammatory erythema) may persist for weeks to months. True acne scars, including ice pick, boxcar, and rolling scars, result from damage to the deeper layers of skin during the inflammatory process.
Certain factors may increase your likelihood of developing Acne.
Common approaches to managing acne. Always consult a healthcare provider for personalized treatment.
Retinoids (adapalene, tretinoin, tazarotene) are considered the backbone of acne treatment. They normalize follicular keratinization, prevent comedone formation, promote cell turnover, and have anti-inflammatory properties. Adapalene 0.1% gel is available over the counter, while stronger formulations require a prescription. Results typically take 8-12 weeks.
Benzoyl peroxide is an antimicrobial agent that kills C. acnes bacteria through oxidation. Available in concentrations of 2.5% to 10%, it also has mild comedolytic properties. It is effective used alone or in combination with topical retinoids or antibiotics. Importantly, bacteria do not develop resistance to benzoyl peroxide.
Topical antibiotics (clindamycin, erythromycin) combined with benzoyl peroxide reduce bacterial counts and inflammation. Oral antibiotics (doxycycline, minocycline) are prescribed for moderate-to-severe inflammatory acne for short courses (typically 3-6 months) due to concerns about antibiotic resistance.
For women with hormonal acne, combined oral contraceptive pills containing estrogen and progestin can reduce androgen-driven sebum production. Spironolactone, an anti-androgen medication, is particularly effective for adult female acne affecting the lower face and jawline. These treatments address the underlying hormonal drivers of acne.
Isotretinoin is the most effective treatment for severe, recalcitrant acne. This oral retinoid dramatically reduces sebum production, normalizes keratinization, has anti-inflammatory effects, and reduces C. acnes colonization. A typical course lasts 4-6 months and can produce long-term remission or cure. Requires careful monitoring due to potential side effects including teratogenicity.
Dermatological procedures complement medical therapy. Chemical peels (glycolic acid, salicylic acid) improve mild comedonal acne. Intralesional corticosteroid injections rapidly flatten individual cysts and nodules. For acne scarring, options include laser resurfacing, microneedling, subcision, dermal fillers, and chemical reconstruction of skin scars (CROSS technique).
Acne is diagnosed clinically through visual examination of the skin by a healthcare provider or dermatologist. The physician assesses the types of lesions present (comedones, papules, pustules, nodules, cysts), their distribution and severity, and the presence of scarring. Acne is commonly graded as mild (mostly comedones with few inflammatory lesions), moderate (multiple papules and pustules with occasional nodules), or severe (numerous inflammatory lesions with nodules and cysts). In adult women, evaluation may include hormonal testing for androgens, DHEA-S, and other markers to rule out polycystic ovary syndrome or other endocrine disorders. The physician also reviews medications, skincare products, and family history. Laboratory testing including lipid panels and liver function tests is required before and during isotretinoin treatment. Differential diagnosis includes rosacea, folliculitis, perioral dermatitis, and keratosis pilaris.
Consult a dermatologist if over-the-counter treatments have not improved your acne after 2-3 months, if you have severe or cystic acne with deep painful nodules, if acne is causing significant scarring, or if acne is impacting your self-esteem and mental health.
Steps that may help reduce the risk of developing or worsening acne.
Wash the face gently twice daily with a mild, non-comedogenic cleanser and avoid scrubbing or over-washing, which can worsen irritation
Choose skincare products and cosmetics labeled non-comedogenic and oil-free to avoid clogging pores
Avoid touching or picking at the face, as this transfers bacteria and oils and can worsen breakouts and cause scarring
Shower promptly after exercise and sweating to prevent pore clogging, and change out of sweaty clothing quickly
Maintain a consistent evidence-based skincare routine including a topical retinoid for maintenance even after active acne has cleared
If left untreated or poorly managed, acne may lead to:
Research suggests a possible link between certain dietary factors and acne, though the relationship is complex and individual. High-glycemic-index foods (white bread, sugary snacks, processed foods) may worsen acne by increasing insulin levels and androgen activity. Some studies also suggest a connection between dairy consumption and acne. However, evidence is not strong enough to recommend specific dietary restrictions for everyone. A balanced diet rich in fruits, vegetables, and whole grains supports overall skin health.
Having oily skin increases the risk of acne but does not guarantee it. Acne requires multiple factors including excess oil, abnormal skin cell shedding within the follicle, bacterial colonization, and inflammation. Many people with oily skin never develop significant acne, while some individuals with normal or combination skin do. Using oil-free, non-comedogenic skincare products and gentle cleansing can help manage oily skin without stripping it of necessary moisture.
This initial worsening, sometimes called 'purging,' commonly occurs when starting retinoid-based treatments. Retinoids accelerate skin cell turnover, which brings existing microcomedones (clogged pores not yet visible) to the surface faster. This process can temporarily increase visible breakouts during the first 4-6 weeks of treatment. The purging phase is normal and typically resolves within 8-12 weeks as the medication continues to work. Consistent use is key to achieving long-term improvement.
There is no specific age at which acne universally stops. While acne is most common during the teenage years due to hormonal changes of puberty, it can persist well into the 20s, 30s, 40s, and beyond. Adult acne is increasingly recognized, particularly in women, and may be related to hormonal fluctuations, stress, or other factors. Approximately 12-22% of women and 3% of men experience acne in their adult years. Effective treatments are available for all ages.
This information is for educational purposes only and is not a substitute for professional medical advice, diagnosis, or treatment. Always seek the advice of your physician or other qualified health provider with any questions you may have regarding a medical condition.