Acne in Childhood and Adolescence

Acne Ages - Tiny Pimples, Big Stages

• Neonatal (Birth-8 wks): Transient facial papules/pustules, few comedones. Maternal/neonatal androgens. Usually resolves spontaneously.

  ⭐ Neonatal acne is typically transient and benign, often resolving spontaneously.

• Infantile (6 wks-1 yr): More inflammatory lesions, comedones prominent. ↑DHEAS, LH-driven androgens. Risk of scarring.
• Mid-Childhood (1-<7 yrs): RARE. Comedones, papules. Always investigate for hyperandrogenism (e.g., premature adrenarche, CAH).
• Pre-Adolescent/Adolescent (≥7 yrs): Common. Comedones, inflammatory lesions. Due to pubertal androgens, P. acnes.

Pimple Genesis - Acne's Core Four

📌 'FOIL' for Pathogenesis: Follicular hyperkeratinization, Oil (Sebum overproduction), Inflammation, 'Libacter' (Cutibacterium acnes).

• Follicular hyperkeratinization: Accelerated shedding & cohesion of keratinocytes obstructs the pilosebaceous duct, forming the initial microcomedone.
• Oil (Sebum) overproduction: Androgenic hormones (especially during puberty) stimulate sebaceous glands, leading to increased sebum secretion.
• Inflammation: Triggered by C. acnes and sebum-derived lipids, involving innate and adaptive immune responses, leading to papules, pustules, nodules.
• Libacter (Cutibacterium acnes): This anaerobic bacterium colonizes the lipid-rich environment of the follicle, metabolizing sebum and releasing pro-inflammatory mediators.

⭐ Androgens are key drivers, stimulating sebaceous glands to produce more sebum, a critical factor in acne development.

Acne Detectives - Lesions & Lineup

Key Lesion Types & Characteristics:

⭐ The presence of comedones is pathognomonic for acne vulgaris.

• Look For: Polymorphic lesions (comedones, papules, pustules often coexist), distribution (face, chest, back), presence of scarring, and signs of endocrinopathy (e.g., hirsutism, irregular menses - consider hyperandrogenism).

Acne Arsenal - Clearing the Coast

• Goal: ↓ lesions, scarring, psychosocial impact via tailored therapy.
• Topical Agents (First-line for mild-moderate):
  • Retinoids (Tretinoin, Adapalene): Normalize keratinization.
  • Benzoyl Peroxide (BPO): Antibacterial, comedolytic.
  • Topical Antibiotics (Clindamycin): Use with BPO (↓ resistance).
  • Azelaic Acid: Antibacterial, anti-inflammatory, comedolytic.
• Systemic Agents (Moderate-severe, or resistant):
  • Oral Antibiotics (Doxycycline, Azithromycin): Min. 6-8 weeks.
  • Oral Isotretinoin: For severe, nodulocystic/scarring acne. Dose: 0.5-1 mg/kg/day. ⚠️ Teratogenic.
  • Hormonal (OCPs, Spironolactone): For females with PCOD signs/late acne.

⭐ Systemic isotretinoin is highly effective for severe, nodulocystic acne but is a potent teratogen requiring strict contraception (e.g., two reliable methods) in females of childbearing potential.

High‑Yield Points - ⚡ Biggest Takeaways

• Neonatal acne: Self-limiting, no comedones. Infantile acne: Comedones present, may scar, consider endocrinopathy if severe.
• Mid-childhood acne (1-7 years): Rare, mandates endocrine evaluation (e.g., CAH, precocious puberty).
• Adolescent acne pathogenesis: Cutibacterium acnes, ↑sebum, follicular hyperkeratinization, inflammation.
• First-line therapy: Topical retinoids (e.g., adapalene) and benzoyl peroxide.
• Severe/nodulocystic acne: Oral isotretinoin is key; monitor side effects (teratogenicity, LFTs, lipids).
• PCOS: Suspect in adolescent females with acne, hirsutism, and menstrual irregularities.
• Tetracyclines (Doxycycline, Minocycline): Contraindicated in children <8 years due to teeth staining and bone effects.