Acne Vulgaris
Acne vulgaris is a common inflammatory skin condition caused by blocked hair follicles and oil glands, leading to pimples, blackheads, and cysts.
Emergency Management: Acne fulminans requires immediate initiation of systemic corticosteroids (Prednisone 0.5-1 mg/kg/day) followed by delayed isotretinoin to control intense systemic inflammation.
A chronic inflammatory disorder of the pilosebaceous unit, comprising the hair follicle and sebaceous gland. The core pathology involves abnormal follicular keratinization, increased sebum production, Cutibacterium acnes proliferation, and subsequent inflammation, primarily affecting the face, chest, and back.
Detailed Overview
Acne vulgaris is the most common skin disease, characterized by non-inflammatory lesions (open and closed comedones) and inflammatory lesions (papules, pustules, nodules, and cysts). Androgens drive sebaceous gland hyperplasia and excess sebum, creating a lipid-rich environment conducive to C. acnes overgrowth. The bacterial lipases hydrolyze sebum triglycerides into pro-inflammatory free fatty acids, triggering intense local immune responses. It carries significant psychological morbidity and can lead to permanent scarring if inadequately treated.
Epidemiology & Demographics
Prevalence: Affects up to 85% of adolescents and young adults aged 12-24. Incidence declines with age, though adult-onset acne affects up to 15% of women in their 30s and 40s. Slight male predominance in adolescence (more severe forms), but female predominance in adulthood.
Etiological Mechanism
Multifactorial: driven by androgenic hormones, genetics (high heritability), Cutibacterium acnes colonization, and innate immune system activation. Secondary triggers include medications (corticosteroids, lithium) and endocrine disorders (PCOS).
Primary Causes
Hormonal fluctuations (puberty, menstrual cycle)
Genetics
Polycystic Ovary Syndrome (PCOS)
Medications (steroids, testosterone, lithium)
Occlusive cosmetics
1. Microcomedone formation: Hyperproliferation and retention of follicular keratinocytes block the follicular ostium. 2. Sebum overproduction: Androgens stimulate sebocytes to produce excessive sebum. 3. Bacterial colonization: The anaerobic, lipid-rich plugged follicle provides an ideal environment for Cutibacterium acnes. 4. Inflammation: C. acnes activates Toll-like receptor 2 (TLR-2) on monocytes and neutrophils, releasing pro-inflammatory cytokines (IL-1, IL-8, TNF-alpha), leading to follicular rupture and intense dermal inflammation.
Diagnostic Criteria & Guidelines
Clinical diagnosis based on the presence of comedones (essential for distinguishing from rosacea/folliculitis) alongside inflammatory lesions in typical seborrheic areas (face, chest, back).
Mild: Topical retinoids (Adapalene 0.1% gel daily) + Topical Benzoyl Peroxide (BPO) 2.5-5% wash daily. Moderate: Add oral antibiotics (Doxycycline 100 mg PO BID for max 3-4 months).
Second-Line & Adjunctive Therapy
Severe/Nodulocystic: Oral Isotretinoin 0.5-1.0 mg/kg/day for 15-20 weeks (cumulative dose 120-150 mg/kg). Hormonal therapy in females: Spironolactone 50-100 mg/day or combined oral contraceptives (e.g., Ethinyl estradiol/Drospirenone).
Surgical & Procedural Management
Comedone extraction, intralesional triamcinolone acetonide (2.5 mg/mL) injections for large cystic lesions. Laser resurfacing or microneedling for post-acne scarring.
Patient Counseling & Advice
Inform the patient that topical treatments may cause initial irritation, dryness, and a 'purging' phase where acne temporarily worsens. It takes 6-8 weeks of consistent use to see clinical improvement. Emphasize strict adherence to iPLEDGE protocol (pregnancy prevention) if starting oral isotretinoin, as it is highly teratogenic.
Follow-Up & Monitoring Schedule
Follow up every 4-8 weeks to assess tolerability and efficacy of topical treatments. For isotretinoin, monthly monitoring of pregnancy tests (females), liver function tests (ALT/AST), and lipid panels (triglycerides).
Preventive Strategies
Consistent use of maintenance topical retinoids even after skin clears. Prompt washing after intense sweating. Avoiding occlusive hair products (pomades) near the forehead.
Excellent with proper treatment, though chronicity requires long-term maintenance therapy. Delayed treatment increases the risk of permanent physical scarring and psychosocial sequelae.