1.8 Skin Integrity Across the Lifespan: Neonatal, Pediatric, Adult, and Geriatric

Skin Integrity Across the Lifespan

Objective 1.10 asks you to analyze skin integrity across the lifespan — neonate, pediatrics, adults, geriatric. The WCC exam is multidisciplinary and covers every care setting, so a question can just as easily concern a 26-week neonate in the NICU as a 92-year-old in long-term care. What the exam rewards is knowing how each age group's skin differs from the adult baseline and how that difference changes the plan.

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1. The Neonate, Especially the Preterm Neonate

Barrier immaturity

The stratum corneum is the barrier. At term, it is roughly 10 to 20 cell layers thick. In an infant born before 30 weeks' gestation it may be only two to three layers, and in the extremely preterm infant it can be nearly absent. Consequences follow directly:

• Transepidermal water loss (TEWL) is dramatically elevated, causing fluid and electrolyte derangement and evaporative heat loss. This is why extremely preterm infants are nursed in high-humidity isolettes.
• Percutaneous absorption is high, and the infant's body surface area to mass ratio is roughly three to five times an adult's. A topical agent that is trivial on an adult can produce systemic toxicity in a neonate. Avoid alcohol-based preparations (chemical burn risk), routine povidone-iodine (transcutaneous absorption and thyroid suppression), and solvent-based adhesive removers.
• Barrier function matures over roughly two to four weeks after birth in the moderately preterm, and considerably longer in the extremely preterm.

Adhesive injury and epidermal stripping

The dermal-epidermal junction in a neonate has fewer and immature anchoring fibrils. The epidermis therefore separates from the dermis more readily than the adhesive separates from the epidermis, so removing a strong adhesive strips skin. Practice implications:

• Use silicone-based adhesives and hydrogel electrodes wherever possible.
• Apply a pectin or hydrocolloid barrier beneath any tape or device that must be secured.
• Remove adhesives slowly, horizontally, with water or mineral oil, supporting the skin — never perpendicular and never quickly.
• Avoid adhesive removers containing solvents.

Pressure injury in the neonate and infant

Two facts dominate the exam:

1. The occiput is the most common pressure injury site in infants and children up to roughly age three, because the head is proportionally the heaviest part of the body and the child lies supine. The sacral predominance of adults does not apply.
2. The majority of pressure injuries in this population are medical device-related — CPAP prongs and masks on the nasal septum and columella, pulse oximeter probes on the foot or hand, ETT and securement tape, IV hubs, orogastric tubes, pulse oximetry cables coiled under a limb, and identification bands. Prevention is device rotation, correct sizing, prophylactic thin foam or hydrocolloid under the device, and inspection of the skin under every device at least every shift.

Risk is scored with the Braden Q or, where medical devices dominate, the Braden QD (both covered in section 2.7).

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2. Children

Beyond infancy, the child's skin approaches adult structure, but several differences persist:

• The occipital predominance persists to roughly age three, after which the sacrum and heels take over as in adults.
• Children have a higher body surface area to mass ratio throughout childhood, so fluid loss from large wounds and burns is proportionally greater and burn resuscitation formulas differ.
• Scarring and contracture across joints matter more because the child will grow; a contracture that is minor at age four can be functionally disabling at fourteen. Early referral for pressure garments, splinting, and therapy is standard.
• Assent, distraction, and play-based preparation are part of the procedure, and FLACC or Wong-Baker FACES replaces the numeric scale (see section 1.6).

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3. The Adult Baseline

Adult skin is the reference state for everything else in this guide: an intact multilayer stratum corneum, an interdigitated dermal-epidermal junction with well-formed rete ridges, robust collagen and elastin, a full complement of appendages, and an inflammatory and proliferative response that closes an acute wound within the expected timeline. Adult risk in this age band is driven by acquired disease — diabetes, venous and arterial insufficiency, obesity, immobility from injury — rather than by intrinsic skin change.

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4. The Geriatric Adult

Intrinsic aging changes each layer, and each change maps to a specific clinical vulnerability:

The critical nuance: aging delays healing; it does not prevent it. An older adult's wound will close given adequate perfusion, nutrition, off-loading, and infection control. Attributing a non-healing wound to age alone is a clinical error and, under Domain 6, a documentation liability.

Skin tears and the ISTAP classification

Skin tears are a traumatic wound of the older adult caused by shear, friction, or blunt force, separating the epidermis from the dermis. The International Skin Tear Advisory Panel (ISTAP) classification is:

• Type 1 — No skin loss. The flap can be fully repositioned to cover the wound bed.
• Type 2 — Partial flap loss. The flap cannot fully cover the wound bed.
• Type 3 — Total flap loss. The wound bed is entirely exposed.

Management: cleanse gently, approximate the flap without stretching it, and secure with a non-adherent silicone contact layer or a soft silicone foam. Mark the dressing with an arrow indicating the direction of removal so the next clinician does not peel the flap back off. Never close a skin tear with sutures or standard adhesive strips in fragile skin.

Skin failure at the end of life

In the dying patient, skin — the body's largest organ — can fail along with other organ systems even under ideal care. Kennedy terminal ulcers typically appear suddenly on the sacrococcygeal area as a pear-, butterfly-, or horseshoe-shaped lesion with red, yellow, or black discoloration, progressing rapidly in the days before death. Recognizing skin failure supports a shift to palliative goals (comfort, odor, and exudate control) rather than closure, and it belongs in the documentation as a distinct entity from a preventable pressure injury.