Clinical Skills · Assessment of the Integumentary System

Factors Affecting Skin Integrity

9 min read

Review flags: Pressure-injury staging definitions and risk-tool cutoff scores evolve with international guidelines (e.g., NPUAP/EPUAP terminology) and facility protocols — verify current standardized definitions and your institution's risk assessment/repositioning policies before clinical application.

On this page 9 sections

In 30 seconds
Why this matters
The college version
Eli explains
Worked example
Key takeaway
Check yourself
Study tools
Sources & references

In 30 seconds

means the skin is intact — unbroken, healthy, and able to perform its protective functions. When it fails, the body loses its first line of defense: microorganisms enter and fluids escape. Factors affecting skin integrity are the forces and conditions that raise the risk of breakdown — central to nursing because skin breakdown is largely preventable with systematic assessment and care.

The factors fall into two families. Intrinsic factors come from inside the person: age, nutrition, chronic illness, mobility, sensation, moisture. Extrinsic factors come from outside: pressure, , , moisture, irritants. The most feared consequence is the — damage from prolonged pressure, classically over bony prominences such as the sacrum and heels. This topic teaches you to identify risk, use risk assessment tools, distinguish pressure injuries from other skin damage, and apply prevention.

Why this matters

Pressure injuries are a nurse-sensitive quality indicator — their rate reflects nursing care quality — and they are linked to longer stays and increased infection risk.

For the nurse, this topic matters because:

Prevention is a nursing core competency. Repositioning, skin inspection, moisture management, and are everyday nursing interventions.
Risk is predictable. Risk tools and knowledge of risk factors identify vulnerable patients before skin breaks down.
You will encounter it everywhere: hospitals, long-term care, home health, and outpatient settings.
Documentation protects the patient and the record. Admission skin assessments establish a baseline; without them, pre-existing damage can be misattributed.
Mislabeling is harmful. Confusing a pressure injury with moisture-associated skin damage leads to the wrong plan.

The college version

Core Concepts

Intrinsic factors: what the person brings

Age: Older adults have thinner skin, less collagen and elastin, reduced subcutaneous fat, and slower healing; infant skin is also fragile.
Nutrition and hydration: Skin needs protein (for collagen and repair), calories, vitamins (notably vitamin C), and fluid. Malnutrition, dehydration, and unintended weight loss weaken skin and impair healing.
Chronic illness: Diabetes (impaired healing; neuropathy — the person may not feel injury), peripheral vascular disease, heart, kidney, and lung disease, and immunosuppression all raise risk.
Mobility and sensation: Immobility removes the body's natural pressure-relief mechanism; reduced sensation — from stroke, spinal cord injury, neuropathy, or sedation — means the person does not feel discomfort and does not shift.
Altered mental status: Confusion, sedation, or unconsciousness removes the ability to reposition or report discomfort.
Moisture and continence: Prolonged contact with urine, stool, or sweat softens (macerates) skin and increases friction damage.
Medications: Corticosteroids can thin skin and slow healing; sedatives reduce movement; vasopressors reduce skin blood flow. (Consider each patient's actual medication profile.)

Extrinsic factors: forces from outside

Pressure: Prolonged compression of tissue between a bony prominence and a hard surface (bed, chair, medical device) squeezes capillaries and reduces blood flow; if sustained, tissue is starved of oxygen — classically over the sacrum, coccyx, heels, hips, elbows, and occiput; intensity and duration both matter.
Shear: Skin stays put while deeper tissue and bone slide — as when a patient slides down in bed and sacral skin is pulled taut over the bone. Shear kinks vessels and is especially damaging at the sacrum.
Friction: Rubbing of skin against a surface (dragging across sheets, ill-fitting footwear) abrades the outer skin.
Moisture: Urine, stool, sweat, and wound drainage keep skin wet, making it softer, more fragile, and more susceptible to friction and infection.
Irritants and trauma: Medical devices (tubing, casts, masks), tape, wounds, and burns insult skin on contact.

Pressure injuries: mechanism, sites, and risk assessment

A pressure injury is localized damage to skin and/or underlying tissue, usually over a bony prominence, from pressure — or pressure with shear. Sustained pressure collapses small vessels, causing (inadequate oxygen); when pressure is relieved, blood rushes back, and repeated ischemia–reperfusion cycles can worsen the damage.

Common sites: sacrum/coccyx, heels, hips, elbows, shoulder blades, occiput, and ears — anywhere bone sits close to the skin.

Risk assessment tools: The , the most widely used pressure-injury risk tool in the United States, scores six subscales — sensory perception, moisture, activity, mobility, nutrition, and friction/shear — producing a total score; lower scores mean higher risk and trigger more intensive prevention. (Cutoff values and the prevention bundle are facility-defined — learn your institution's protocol.) Risk assessment is done on admission and repeated as the condition changes; it is not a one-time checkbox.

Staging describes depth: from intact skin with (the earliest sign — press, and the redness persists), through partial-thickness loss, to full-thickness loss involving deeper tissue, with special categories for injuries that cannot be staged at first (covered by slough or eschar, or suspected deep-tissue damage). Accurate staging requires training and standardized definitions (e.g., NPUAP/EPUAP terminology). The bedside nurse's essential skill is recognizing the earliest sign — non-blanchable redness on intact skin — because that is the point where damage is often still reversible. If you cannot stage confidently, document objectively and refer per policy — do not guess.

Moisture-associated skin damage versus pressure injury

Moisture-associated skin damage () — e.g., incontinence-associated dermatitis — is inflammation and erosion from prolonged contact with urine, stool, or other moisture; it is not caused by pressure. It appears as redness, chafing, or superficial peeling in moisture-exposed areas, often in an irregular or "kissing" distribution (both sides of a fold). Treatment differs: MASD responds to moisture management (cleansing, barrier products, continence care), while pressure injuries require offloading. When both are present, each needs its own treatment. If unsure, seek help — mislabeling is a common and costly error.

Prevention: the nursing care bundle

Core preventive interventions, driven by risk assessment and individualized:

Repositioning: A scheduled turning schedule (per facility policy and tolerance) shifts pressure off bony prominences; use pillows, wedges, and heel protectors to offload heels and sacrum.
Skin inspection: Inspect daily and with every reposition, especially over bony prominences, and act on the first sign of redness. Do not massage reddened skin — it can increase injury.
- - Offloading surfaces and early mobility: Specialty mattresses, cushions, and heel boots distribute pressure (facility-directed); early mobilization, when safe, is one of the most effective preventive strategies.
### Documentation

Document the admission skin assessment (including pre-existing injuries — a key medico-legal point), the risk score, interventions, and any change in condition. Use objective descriptions (location, size, color, drainage) and follow the facility's wound documentation format. Report any change or new injury promptly — never silently "wait and see."

Common Confusions

Do Not Confuse	With	Difference
Pressure injury	Moisture-associated skin damage (MASD)	Pressure injury = ischemia over a bony prominence, often one distinct area; MASD = moisture exposure, often irregular/kissing pattern in folds — treatment differs
Non-blanchable redness	Blanchable redness	Blanchable (redness fades with pressure) = normal response, at-risk skin; non-blanchable = earliest pressure injury, act now
Pressure	Friction/shear	Pressure compresses tissue (ischemia); friction abrades the surface; shear distorts deeper tissue — often combine
Repositioning	Treating an existing injury	Repositioning is prevention; once an injury exists it needs treatment per policy plus pressure reduction
A reddened area	A stage-1 pressure injury	Only if redness is non-blanchable on intact skin; reddened but blanchable skin is at risk, not yet injured
Risk assessment score	Diagnosis	The score identifies risk level and drives prevention; it is not a wound diagnosis or staging

Eli explains

The same idea, in plain words

Explain it like I’m 10

If you sit on your hand for a long time, it gets tingly and numb — that's your body telling you to move. People who can't move or can't feel that signal stay in one position too long, and the squished skin starts to get hurt, like a pizza pressed against the box for hours. Nurses prevent this by turning patients regularly, keeping their skin clean and dry, and checking for the first red spots — like rotating your tires so they don't wear out in one place.

Worked example

Mr. Petrov, 74, is admitted after a stroke with right-sided weakness. The admission nurse's skin assessment finds a small sacral area that stays red when pressed — a suspected early pressure injury. The Braden Scale confirms high risk: immobility and reduced sensation on the right, urinary incontinence, and poor intake for days.

The plan follows: repositioning every 2 hours with heels floated and a wedge offloading the sacrum; skin inspection with every turn; cleansing and barrier product for incontinence; a dietary consult; and a specialty mattress ordered by the provider. The nurse documents the baseline redness, risk score, and interventions, and reports the finding. Two days later the redness has faded — caught at the reversible stage. Without this assessment and scoring, the injury would likely have progressed.

Key takeaways

Intrinsic risk factors: age, poor nutrition/hydration, chronic illness (diabetes, vascular disease), immobility, reduced sensation, altered mental status, moisture/incontinence. Extrinsic forces: pressure, shear, friction, moisture, irritants/medical devices.
Pressure injury = ischemia from sustained pressure over a bony prominence — classic sites: sacrum, heels, occiput, hips, elbows.
First sign = non-blanchable redness on intact skin. If redness persists when pressed, damage has begun — act immediately.
Risk tools (e.g., Braden) are scored on admission and re-assessed; lower score = higher risk.
Prevention is a nursing core competency: repositioning, skin inspection, moisture care, nutrition, offloading, early mobility.
Never massage reddened skin — it can worsen existing tissue damage.

Check yourself

6 review questions from the chapter. Try each one, then open the answer.

Give two intrinsic and two extrinsic factors that affect skin integrity.
Show answer
Intrinsic (any two): age, poor nutrition/hydration, chronic illness, immobility, reduced sensation, altered mental status, moisture/incontinence, medications. Extrinsic (any two): pressure, shear, friction, moisture, irritants/medical devices.
What is the mechanism by which prolonged pressure damages tissue, and why do bony prominences matter?
Show answer
Sustained pressure compresses capillaries between bone and a surface, causing ischemia (inadequate oxygen); repeated ischemia–reperfusion cycles worsen damage. Bony prominences (sacrum, heels, occiput) have little tissue between bone and skin — hence the classic sites.
What is the earliest detectable sign of a pressure injury, and what should the nurse do when it appears?
Show answer
Non-blanchable redness on intact skin — redness that persists when pressed. The nurse documents and reports it and immediately intensifies prevention: offloading, repositioning, skin care, reassessment — damage is often still reversible.
How is moisture-associated skin damage different from a pressure injury?
Show answer
MASD is caused by prolonged moisture exposure (urine, stool, sweat) — superficial redness/erosion, often in skin folds or an irregular pattern. A pressure injury is caused by pressure/ischemia over a bony prominence. They need different interventions (moisture management vs. offloading) — though both can coexist.
Name four core prevention interventions for a patient at high risk of skin breakdown.
Show answer
Any four: scheduled repositioning with offloading, daily skin inspection (no massage of red areas), moisture management (cleansing, barrier products, continence care), nutrition/hydration support, specialty support surfaces, early mobility, device-related checks.
Why is a thorough admission skin assessment documented even when the skin looks healthy?
Show answer
It establishes a baseline: pre-existing injuries must be documented so later changes are measurable and not misattributed to the current admission, and prevention can be tracked.

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Study toolsKey vocabulary

Key vocabulary

Skin integrity: The skin being intact and able to protect the body
Pressure injury: Localized tissue damage from prolonged pressure, usually over a bony prominence
Ischemia: Inadequate blood flow (and therefore oxygen) to tissue
Shear: Skin stays put while deeper tissue/bone slides (e.g., sliding down in bed)
Friction: Rubbing of skin against a surface
Maceration: Softening/breaking down of skin from prolonged moisture
Braden Scale: Widely used risk tool scoring 6 subscales (sensory perception, moisture, activity, mobility, nutrition, friction/shear)
Non-blanchable redness: Redness of intact skin that persists when pressed
MASD: Moisture-associated skin damage (e.g., incontinence-associated dermatitis)
Offloading: Positioning/equipment that removes pressure from a vulnerable area

Sources & references

openstax.org — Clinical Nursing Skills

This lesson was adapted from the open educational references above; their licenses and attributions are preserved. See Copyright & Licensing.

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