## Overview
Acne (acne vulgaris, ICD-10: L70) is a chronic inflammatory skin condition that affects the pilosebaceous unit — the hair follicle and its associated sebaceous (oil) gland. It manifests as comedones (blackheads and whiteheads), papules, pustules, nodules, and in severe cases, cysts that can lead to permanent scarring.
Acne is one of the most common dermatological conditions worldwide. It affects an estimated 85% of adolescents and young adults between the ages of 12 and 24, making it nearly universal during puberty [6]. However, acne is not limited to teenagers; studies indicate that 12–22% of adult women and approximately 3% of adult men continue to experience clinically significant acne well into their 30s, 40s, and beyond [2]. Globally, acne vulgaris affects roughly 9.4% of the population, ranking it among the top ten most prevalent diseases worldwide [6].
People search for information about acne for many reasons: cosmetic concern, physical discomfort, scarring prevention, and the psychological burden it carries. Acne has been consistently associated with reduced self-esteem, social anxiety, and depression, especially in adolescents and young adults. Understanding the mechanisms, treatment options, and appropriate escalation points is essential for effective management.
## Common Causes
Acne is a multifactorial disease. Four primary pathophysiological mechanisms drive its development, often working in concert:
### 1. Excess Sebum Production
Androgenic hormones — particularly dihydrotestosterone (DHT) — stimulate the sebaceous glands to produce excess sebum (oil). This is the primary reason acne peaks during puberty when androgen levels surge. Sebum overproduction creates an oily environment that favors follicular plugging and bacterial growth [4].
### 2. Follicular Hyperkeratinization
Normally, dead skin cells (keratinocytes) within the hair follicle shed and are expelled. In acne-prone skin, these cells become sticky and accumulate, forming a plug called a microcomedone. This is the precursor lesion to all visible acne. The process is influenced by hormones, local inflammation, and possibly deficiency in linoleic acid within the sebum [1].
### 3. Cutibacterium acnes (C. acnes) Proliferation
Formerly known as *Propionibacterium acnes*, this anaerobic bacterium is a normal resident of the skin. However, in plugged follicles with abundant sebum, *C. acnes* proliferates and triggers an innate immune response through toll-like receptor activation, producing pro-inflammatory cytokines (IL-1, IL-8, TNF-α) [4].
### 4. Inflammation
Recent research suggests inflammation may actually precede comedone formation in many cases, rather than being merely a downstream consequence. Subclinical inflammation has been detected in normal-appearing skin adjacent to acne lesions, indicating that the inflammatory cascade begins earlier than previously thought [1].
### Contributing and Aggravating Factors (by approximate frequency)
- **Hormonal fluctuations** — menstrual cycle, polycystic ovary syndrome (PCOS), puberty, pregnancy
- **Genetics** — strong familial tendency; having a first-degree relative with acne significantly increases risk
- **Stress** — corticotropin-releasing hormone (CRH) and cortisol can upregulate sebum production
- **Diet** — high-glycemic-index foods and dairy (particularly skim milk) have been associated with acne in observational studies, though evidence remains moderate [1]
- **Medications** — corticosteroids, lithium, certain anticonvulsants, anabolic steroids, testosterone
- **Cosmetics and occlusion** — comedogenic products, tight-fitting clothing, helmets, or equipment that trap heat and moisture
- **Environmental factors** — humidity, occupational exposure to oils and greases
## RED FLAGS
While acne itself is not a medical emergency, certain presentations warrant prompt or immediate medical evaluation:
- **Acne fulminans** — sudden onset of severe, ulcerating, nodular acne accompanied by fever, joint pain (polyarthralgia), and malaise; this is a rare but serious systemic inflammatory reaction requiring **urgent medical care**
- **Signs of systemic hormonal disorder** — acne in a prepubertal child, acne accompanied by hirsutism (excess hair growth), irregular periods, rapid weight gain, or virilization (deepening voice, male-pattern hair loss in women) may suggest an androgen-secreting tumor or congenital adrenal hyperplasia
- **Severe, widespread, suddenly worsening nodular or cystic acne** with significant pain and early scarring — warrants same-day or next-day dermatology referral
- **Signs of secondary skin infection** — expanding redness, warmth, swelling, purulent drainage, red streaking from lesions, or fever, which may indicate cellulitis or abscess requiring antibiotics or drainage
- **Severe depression, suicidal ideation, or self-harm** related to acne's psychological impact — seek immediate mental health support or call emergency services
- **Suspected isotretinoin side effects** — severe headache with visual changes (possible pseudotumor cerebri), rectal bleeding, severe abdominal pain, or mood changes in a patient currently taking isotretinoin
## Self-Care at Home
Mild acne can often be managed with consistent, evidence-based non-pharmacological measures. Patience is key — most treatments require 6–8 weeks to show meaningful improvement.
### Gentle Skin Cleansing
- Wash affected areas no more than twice daily with a mild, non-comedogenic cleanser (pH 5.5 or close to skin's natural pH)
- Avoid harsh scrubbing, abrasive exfoliants, or rough washcloths, which can worsen inflammation
- Rinse with lukewarm water; very hot water can irritate the skin
### Hands-Off Approach
- Avoid picking, squeezing, or popping lesions — this introduces bacteria, delays healing, and increases the risk of scarring and post-inflammatory hyperpigmentation
### Moisturizing
- Even oily skin benefits from a lightweight, oil-free, non-comedogenic moisturizer, particularly when using drying treatments like benzoyl peroxide or retinoids
- Look for products labeled "non-comedogenic" or "won't clog pores"
### Sun Protection
- Use a broad-spectrum SPF 30+ sunscreen daily, especially when using retinoids or other photosensitizing treatments
- Choose oil-free or gel-based formulations to avoid clogging pores
### Dietary Considerations
- Evidence suggests that a low-glycemic-load diet may modestly reduce acne severity [1]. This means limiting refined carbohydrates, sugary drinks, and processed foods
- Some studies associate dairy intake (particularly skim milk) with acne, though the evidence is not strong enough to make universal dietary recommendations
- A balanced diet rich in fruits, vegetables, whole grains, and omega-3 fatty acids generally supports skin health
### Stress Management
- Chronic psychological stress may exacerbate acne through hormonal pathways. Regular physical activity, adequate sleep (7–9 hours), and stress-reduction techniques (mindfulness, deep breathing) may help as adjuncts to standard treatment
### Bedding and Personal Items
- Change pillowcases frequently (at least weekly)
- Clean mobile phone screens regularly
- Avoid sharing towels or makeup applicators
## OTC Medications That Help
Several over-the-counter treatments have strong evidence supporting their use in mild to moderate acne. These are generally the first line of therapy.
| Class | Example | Adult Dose | Notes |
|---|---|---|---|
| **Benzoyl peroxide (BPO)** | Benzac AC, Clean & Clear, Panoxyl | 2.5–10% applied once or twice daily to affected areas | Kills *C. acnes* via oxidative mechanism; does not promote antibiotic resistance [7]. Start with 2.5% to minimize irritation — studies show equal efficacy to 10% with less dryness [1]. Can bleach fabrics. |
| **Salicylic acid** | Stridex, Neutrogena, CeraVe SA | 0.5–2% applied once or twice daily | Beta-hydroxy acid; comedolytic (unclogs pores) and mildly anti-inflammatory. Best for mild comedonal acne. Generally well-tolerated. |
| **Adapalene (retinoid)** | Differin Gel 0.1% (OTC since 2016 in US) | Pea-sized amount to entire face once daily at bedtime | Topical retinoid that normalizes follicular keratinization and has anti-inflammatory properties. Gold-standard OTC treatment [1]. Expect initial "retinization" (dryness, peeling) for 2–4 weeks. Avoid in pregnancy. |
| **Azelaic acid** | The Ordinary Azelaic Acid 10% | 10% applied twice daily | Anti-inflammatory, antibacterial, and reduces post-inflammatory hyperpigmentation. Particularly useful for darker skin tones. Pregnancy category B (generally considered safe). |
| **Sulfur-based products** | De La Cruz Sulfur Ointment | 3–10% applied as mask or spot treatment | Keratolytic and mildly antibacterial. Useful for sensitive skin that cannot tolerate BPO. Distinctive odor. |
| **Niacinamide (Vitamin B3)** | Various serums (4–5%) | 4–5% applied once or twice daily | Anti-inflammatory, reduces sebum production, and may improve skin barrier function. Can be combined with most other actives. |
**Key OTC Contraindications and Precautions:**
- **Benzoyl peroxide**: May cause contact dermatitis in sensitized individuals; avoid contact with eyes, lips, and mucous membranes
- **Adapalene**: Contraindicated in pregnancy; increases sun sensitivity
- **Salicylic acid**: Avoid large-area application in individuals with aspirin allergy; use cautiously in pregnancy (topical low-concentration use is generally considered low risk, but consult a clinician)
## Prescription Options
When OTC therapies fail after 8–12 weeks of consistent use, or when acne is moderate to severe, prescription treatments are indicated. A primary care provider or dermatologist may prescribe the following.
### Topical Prescriptions
| Class | Example | Adult Dose | Notes |
|---|---|---|---|
| **Topical retinoids (stronger)** | Tretinoin (Retin-A) 0.025–0.1%, tazarotene (Tazorac), trifarotene (Aklief) | Applied once daily at bedtime | Cornerstone of acne therapy; normalizes desquamation, reduces comedones, has anti-inflammatory effects [1]. Tazarotene and tretinoin are pregnancy category X. |
| **Topical antibiotics** | Clindamycin 1%, erythromycin 2% | Applied once or twice daily | Should ALWAYS be combined with benzoyl peroxide to reduce antibiotic resistance [7,8]. Never use as monotherapy. |
| **Combination products** | Clindamycin/BPO (Duac, BenzaClin), adapalene/BPO (Epiduo), clindamycin/tretinoin (Veltin) | Per product instructions, once or twice daily | Combination therapy is generally more effective than monotherapy [3]. Improves adherence by reducing number of products. |
| **Topical dapsone** | Aczone 5%, 7.5% | Applied twice daily (5%) or once daily (7.5%) | Particularly effective for adult female acne. Anti-inflammatory. Generally well tolerated [2]. |
| **Clascoterone** | Winlevi 1% cream | Applied twice daily | First-in-class topical androgen receptor inhibitor (FDA-approved 2020). Blocks androgen effects locally at the skin. Suitable for males and females ≥12 years [1]. |
### Systemic (Oral) Prescriptions
| Class | Example | Adult Dose | Notes |
|---|---|---|---|
| **Oral antibiotics** | Doxycycline 50–100 mg, minocycline 50–100 mg, sarecycline (Seysara) | Typically 50–100 mg once or twice daily for 3–4 months maximum | Anti-inflammatory at sub-antimicrobial doses. Limit duration to reduce resistance risk [7,8]. Doxycycline: take with food, avoid sun. Minocycline: risk of vertigo, hyperpigmentation. |
| **Combined oral contraceptives (COCs)** | Yaz (drospirenone/EE), Ortho Tri-Cyclen (norgestimate/EE) | Per product — daily oral use | FDA-approved for acne in women; reduce circulating androgens. Require 2–3 months to show benefit [2]. Contraindicated in smokers >35, history of DVT/PE, certain migraines. |
| **Spironolactone** | Aldactone | 25–200 mg daily (typically 50–100 mg) | Off-label antiandrogen; effective for hormonal acne in adult women. Monitor potassium. Contraindicated in pregnancy (teratogenic — feminizes male fetus) [2]. |
| **Isotretinoin** | Absorica, Claravis, Amnesteem | 0.5–1 mg/kg/day for 15–20 weeks (cumulative dose 120–150 mg/kg) | Most effective acne treatment available; induces prolonged remission in 85% of patients [7]. Reserved for severe nodular/cystic acne or treatment-resistant moderate acne. Requires iPLEDGE program in the US. Pregnancy category X — highly teratogenic. Requires monthly labs (lipids, liver function, pregnancy tests). Prescriber: usually a dermatologist. |
**Important Notes on Prescriptions:**
- Oral antibiotics should not be used as monotherapy and should generally be limited to 3–4 months to minimize resistance [1,8]
- Isotretinoin requires two forms of contraception in females of reproductive potential and monthly pregnancy testing under the FDA iPLEDGE Risk Evaluation and Mitigation Strategy (REMS) program
- Spironolactone is used only in females; it can cause gynecomastia and sexual side effects in males
## Lab Tests Typically Ordered
Most cases of acne do not require laboratory testing. However, certain clinical situations warrant investigation:
| Test | Rationale | When Ordered |
|---|---|---|
| **Serum testosterone (total and free)** | Evaluate for hyperandrogenism in women with acne plus hirsutism, alopecia, or irregular menses | Suspected PCOS or androgen-secreting tumor |
| **DHEA-S (dehydroepiandrosterone sulfate)** | Elevated levels suggest adrenal source of excess androgens | Suspected congenital adrenal hyperplasia or adrenal tumor |
| **17-hydroxyprogesterone** | Screening test for late-onset congenital adrenal hyperplasia (CAH) | Suspected CAH |
| **Fasting lipid panel** | Isotretinoin can cause hypertriglyceridemia and elevated LDL cholesterol | Before and during isotretinoin therapy (monthly) |
| **Liver function tests (AST, ALT)** | Isotretinoin is hepatotoxic in rare cases | Before and during isotretinoin therapy |
| **Complete blood count (CBC)** | Isotretinoin can rarely cause cytopenias | Baseline before isotretinoin |
| **Serum pregnancy test (β-hCG)** | Isotretinoin is a potent teratogen (FDA category X) | Monthly during isotretinoin in females of reproductive potential |
| **Fasting glucose / HbA1c** | PCOS-associated acne may coexist with insulin resistance | When PCOS is suspected |
| **Prolactin** | Rule out prolactinoma in women with acne, amenorrhea, and galactorrhea | Amenorrhea workup |
Consult your healthcare provider about which tests are appropriate for your situation.
## Special Populations
### Children and Adolescents
- **Neonatal acne** (first 6 weeks of life) is common, usually mild, and typically resolves without treatment
- **Infantile acne** (3–6 months) may require gentle treatment; comedonal acne in infants can occasionally be more persistent
- **Prepubertal acne** (before age 7–8 in girls, 9 in boys) is unusual and may signal precocious puberty or an underlying endocrine disorder — warrants pediatric endocrinology referral
- **Adolescent acne** is extremely common and is managed similarly to adults, though with careful attention to age-appropriate dosing
- Adapalene 0.1% gel is approved for ages ≥12 years
- Isotretinoin is generally reserved for patients ≥12 years with severe, scarring acne unresponsive to other treatments. Pediatric dosing should be determined by a dermatologist experienced with this medication
- **Do not use tetracycline-class antibiotics** (doxycycline, minocycline) in children under 8 years of age due to risk of permanent tooth discoloration and effects on bone growth
- Always consult a pediatrician or pediatric dermatologist before initiating prescription acne treatment in children
### Pregnancy and Lactation
Acne management in pregnancy requires careful consideration of teratogenic risk.
| Medication | Pregnancy Safety | Notes |
|---|---|---|
| Benzoyl peroxide | Generally considered safe (minimal systemic absorption) | Topical use in limited areas is acceptable |
| Azelaic acid | Category B — generally considered safe | Often first-line in pregnancy |
| Topical erythromycin | Category B — generally considered safe | Can combine with BPO |
| Oral erythromycin / azithromycin | Generally considered acceptable when needed | Consult prescriber |
| Salicylic acid (topical, low %) | Low risk in small areas; avoid large-area or prolonged use | Consult clinician |
| **Tretinoin, tazarotene, adapalene** | **CONTRAINDICATED** (Category X) | Retinoids are teratogenic |
| **Isotretinoin** | **ABSOLUTELY CONTRAINDICATED** (Category X) | Must be stopped ≥1 month before conception |
| **Tetracyclines** | **CONTRAINDICATED** | Tooth discoloration, bone growth effects on fetus |
| **Spironolactone** | **CONTRAINDICATED** | Antiandrogen effects on male fetus |
| **Hormonal therapies (COCs)** | **CONTRAINDICATED in pregnancy** | — |
Breastfeeding women should consult their physician; topical benzoyl peroxide and azelaic acid are generally compatible with lactation.
### Elderly
- New-onset acne in older adults is uncommon and should prompt evaluation for an underlying cause, including medication-induced acne (corticosteroids, lithium) or, rarely, an androgen-secreting tumor
- Skin in older adults tends to be thinner and drier; topical retinoids and benzoyl peroxide should be used at lower concentrations with increased moisturization
- Drug interactions are more likely in elderly patients on multiple medications — review the full medication list before prescribing
### Athletes
- **Acne mechanica** is common among athletes and is caused by friction, pressure, heat, and occlusion from helmets, shoulder pads, headbands, and tight clothing
- Prevention: wear moisture-wicking fabrics, shower promptly after exercise, and use non-comedogenic sunscreen
- Anabolic steroid use (doping) can cause severe, treatment-resistant acne — healthcare providers should screen for this when appropriate
- Competitive athletes should be aware that spironolactone is on some sport-specific banned substance lists (check with WADA/relevant sports authority)
- Isotretinoin may cause musculoskeletal side effects (arthralgias, myalgias), which may affect training; discuss with a sports medicine physician if relevant
## When to Escalate
Knowing when to move beyond self-care is an important part of acne management.
### Continue Self-Care (OTC Treatment)
- Mild comedonal acne (blackheads, whiteheads) with no scarring
- Acne that has been present for less than 8–12 weeks of consistent OTC treatment
- No significant psychological distress
### Schedule a GP or Dermatologist Appointment (Days to Weeks)
- Moderate acne (numerous papules/pustules) not responding to 8–12 weeks of consistent OTC therapy
- Acne causing post-inflammatory hyperpigmentation or early scarring
- Hormonal acne patterns in women (flares with menstrual cycle, jawline distribution)
- Acne causing significant emotional distress, social withdrawal, or low self-esteem
- Need for prescription medication (topical retinoids, antibiotics, hormonal therapy)
### Same-Day or Urgent Appointment
- Rapid onset of widespread, painful, deep nodular or cystic acne
- Signs of secondary infection: spreading redness, warmth, purulent drainage, red streaking, fever
- Severe psychological distress, anxiety, or depression related to acne
- New acne in a prepubertal child (needs endocrine evaluation)
### Emergency Department
- **Acne fulminans**: sudden, severe ulcerative acne with systemic symptoms (fever, joint pain, malaise, leukocytosis) — this is a medical emergency
- Signs of sepsis from secondary skin infection (high fever, rapid heart rate, confusion, hypotension)
- Suicidal thoughts or self-harm related to acne's psychological impact — call emergency services or a crisis hotline immediately
- Severe suspected drug reaction (e.g., pseudotumor cerebri symptoms on isotretinoin: severe headache, visual disturbances, nausea)
## References
[1] Zaenglein AL, Pathy AL, Schlosser BJ, et al. Guidelines of care for the management of acne vulgaris. *J Am Acad Dermatol*. 2016;74(5):945-973.e33. PMID:26897386.
[2] Tan AU, Schlosser BJ, Paller AS. A review of diagnosis and treatment of acne in adult female patients. *Int J Womens Dermatol*. 2018;4(2):56-71. PMID:29872679.
[3] Leyden JJ. A review of the use of combination therapies for the treatment of acne vulgaris. *J Am Acad Dermatol*. 2003;49(3 Suppl):S200-S210. PMID:12963896.
[4] Thiboutot D, Gollnick H, Bettoli V, et al. New insights into the management of acne: an update from the Global Alliance to Improve Outcomes in Acne group. *J Am Acad Dermatol*. 2009;60(5 Suppl):S1-S50. PMID:19376456.
[5] Nast A, Dréno B, Bettoli V, et al. European evidence-based (S3) guideline for the treatment of acne — update 2016. *J Eur Acad Dermatol Venereol*. 2016;30(8):1261-1268. PMID:27514932.
[6] Bhate K, Williams HC. Epidemiology of acne vulgaris. *Br J Dermatol*. 2013;168(3):474-485. PMID:23210645.
[7] Strauss JS, Krowchuk DP, Leyden JJ, et al. Guidelines of care for acne vulgaris management. *J Am Acad Dermatol*. 2007;56(4):651-663. PMID:17276540.
[8] Walsh TR, Efthimiou J, Dréno B. Systematic review of antibiotic resistance in acne: an increasing topical and oral threat. *Lancet Infect Dis*. 2016;16(3):e23-e33. PMID:26852728.
[9] U.S. Food and Drug Administration. iPLEDGE Program for Isotretinoin. FDA Risk Evaluation and Mitigation Strategy (REMS). Available at: https://www.fda.gov/drugs/postmarket-drug-safety-information-patients-and-providers/ipledge-program. Accessed 2025.
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*This article is for informational purposes only and does not constitute medical advice. Always consult a qualified healthcare professional for diagnosis and treatment of any medical condition. PillsCard.com content is peer-reviewed but should not replace the clinical judgment of your personal physician or dermatologist.*
