Pediatric and Adolescent Dermatology
The move from infancy into childhood (ages 1–11) and adolescence (ages 12–18) is tied to two major biological milestones: maturation of the skin's immune barrier and epidermal structure, and the surge of androgens at puberty (adrenarche and gonadarche).
Children's Skin (Ages 1–11): A Maturing but Vulnerable Barrier
- Structure: The stratum corneum and epidermis reach 70–80% of adult thickness, but keratinocyte density and desmosomal connections are not yet fully tight.
- Sebaceous quiescence: Once maternal hormones have fully cleared after the newborn period, the sebaceous glands go into a resting state. Children produce very little surface sebum, so their hydrolipid film is low in squalene and wax esters.
- Natural moisturizing factor (NMF) and atopic dermatitis: Heterozygous or homozygous loss of the filaggrin gene (FLG) at this age sharply reduces free amino acids (UCA, PCA) and increases transepidermal water loss (TEWL), allowing allergens to penetrate the skin and trigger Th2/Th17-driven inflammation.
Adolescent Skin (Ages 12–18): Sebaceous Gland Activity and How Acne Develops
- The androgen surge: Activation of the hypothalamic–pituitary–adrenal/gonadal axis drives a sharp rise in dehydroepiandrosterone sulfate (DHEA-S) and testosterone.
- The role of type 1 5α-reductase: In the sebocyte, type 1 5α-reductase converts testosterone to dihydrotestosterone (DHT), which binds the androgen receptor (AR) 5–10 times more strongly.
- The four pillars of adolescent acne (acne vulgaris):
- Excess sebum production (hyperseborrhea): The lipid profile shifts, with more oxidized squalene and less linoleic acid.
- Follicular hyperkeratinization: Imbalanced sebum irritates keratinocytes in the follicle opening, forming a plug called a microcomedone.
- Overgrowth of Cutibacterium acnes: The oxygen-poor, lipid-rich environment lets C. acnes (especially phylotype IA1) multiply rapidly.
- Inflammation via pattern recognition receptors (TLR-2/TLR-4): C. acnes releases lipases and proteases and switches on the NF-κB pathway, releasing the pro-inflammatory cytokines IL-1α, IL-8 and TNF-α and producing pustules, inflamed papules and cysts.
Common Skin Conditions by Age Group
Typical Conditions in Children (Ages 1–11)
- Childhood atopic dermatitis:
- Lesions shift from the face (in infancy) to the skin folds (flexural areas): the inner elbows, backs of the knees, wrists, ankles and around the neck.
- Appearance: redness, dry scaly papules, scratch marks (excoriations) and thickened, leathery skin (lichenification) from chronic itching.
- Impetigo:
- A superficial skin infection caused by Staphylococcus aureus or Streptococcus pyogenes.
- Typical lesions: fragile, superficial blisters or pustules that break easily and leave honey-colored crusts, mainly around the nose and mouth and on the limbs.
- Molluscum contagiosum:
- Infection with molluscum contagiosum virus (MCV), a member of the Poxviridae family.
- Pearly or skin-colored papules, 2–5 mm across, with a central umbilication (a small central dimple).
Typical Conditions in Adolescents (Ages 12–18)
- Adolescent acne (acne vulgaris):
- Non-inflammatory acne: closed comedones (whiteheads) and open comedones (blackheads, which turn dark as melanin and lipids oxidize on contact with air).
- Inflammatory acne: red papules, pustules, nodules and cysts, which can destroy dermal tissue and leave atrophic scars (icepick, boxcar and rolling scars).
- Location: starts in the T-zone (forehead, nose) and gradually spreads to the U-zone (cheeks, chin), back and chest.
- Adolescent seborrheic dermatitis: Greasy yellow scale on red skin in areas rich in oil glands (the folds beside the nose, between the eyebrows, along the hairline, and on the scalp as itchy dandruff).
- Keratosis pilaris: Keratin plugs block the hair follicles, giving a rough "goosebump" texture on the outer upper arms, thighs and buttocks that worsens in cold, dry winter weather.
Skin Care and Treatment Protocols for Children and Teens at Haute-Derma
At Haute-Derma, skin treatment for children and adolescents follows a comprehensive, medically based protocol (the Haute-Derma Pediatric & Teen Skin Protocol) that combines standard medical therapy with technologies that restore skin structure:
Restoring the Barrier and Optimizing the Daily Skin-Care Routine
- Medical-grade cleansing: Gentle soap-free cleansers (syndets) with a physiologic pH of 5.5, containing niacinamide and zinc PCA to reduce sebum production without stripping the hydrolipid film.
- Targeted moisturizing (non-comedogenic moisturizers):
- For children (atopic dermatitis): Moisturizers with ceramides NP/AP/EOP and phytosphingosine to rebuild the "bricks and mortar" of the epidermis.
- For teens (acne-prone skin): Lightweight gel or lotion moisturizers with hyaluronic acid and panthenol (B5) to soothe peeling from acne treatments without clogging pores.
Evidence-Based Medical Treatment of Adolescent Acne
- Newer-generation topical retinoids (adapalene 0.1–0.3% / trifarotene 0.005%): Act selectively on the RAR-γ receptor in the skin to normalize keratinization in the follicle, provide strong anti-inflammatory effects and prevent microcomedones from forming.
- Benzoyl peroxide (BPO) 2.5–5%: Releases free oxygen that kills C. acnes through oxidation, so it does not cause antibiotic resistance.
- Carefully controlled topical/oral antibiotics: Topical clindamycin combined with BPO (or a short 8–12 week course of oral doxycycline or lymecycline for severe nodulocystic acne) to calm acute inflammatory flares.
Light-Based Technologies and Treatment of Scars and Marks at Haute-Derma
- Light therapy (blue light 415 nm and red light 630 nm): Blue light activates the porphyrins produced by C. acnes, generating free radicals that kill the bacteria; red light penetrates deeper to reduce swelling and inflammation and support tissue repair.
- BHA chemical peel (salicylic acid 15–30%): This oil-soluble acid works its way down into the follicle, dissolves trapped sebum, clears blockages and makes pores look smaller.
- Treating marks and early scars (PIE/PIH and early scars):
- Pico laser (1064 nm / 532 nm): Breaks up clusters of melanin left after acne (PIH) and shrinks dilated red capillaries (PIE).
- Subcision combined with fractional CO2 laser: Releases the fibrous bands tethering atrophic scars from adolescent nodulocystic acne early on, while a teenager's capacity to build new collagen is at its peak.
