Nursing care
Pressure injury vs moisture-associated skin damage: location, shape and care
Written and reviewed by Dana Whitfield, RN, MSN · 3 min read · Updated October 2026
Short answer
A pressure injury results from sustained pressure, often with shear, and usually lies over a bony prominence or under a device with defined edges. Moisture-associated skin damage, such as incontinence-associated dermatitis, comes from prolonged contact with urine, stool or sweat and appears as diffuse, superficial redness or erosion in skin folds and the perineum.
Look first at location relative to bone
The most useful single clue is where the damage sits. Pressure injuries develop where tissue is squeezed between bone and a surface, such as the sacrum, heels, hips and ischial areas, or beneath a medical device. Incontinence-associated dermatitis follows the areas exposed to urine or stool, including the perineum, groin, buttocks, gluteal cleft and inner thighs.
A red area in the gluteal cleft that is not over a bony point, in a client with frequent loose stools, suggests moisture damage. A sharply outlined area directly over the sacrum or heel in a client who rarely changes position suggests pressure. Some lesions sit in both zones, so location is a starting point rather than the full answer.
Compare shape, edges and depth
Moisture damage is usually diffuse, patchy or blotchy, with poorly defined edges. It is superficial: intact red skin, sometimes with partial-thickness erosion, blistering or weeping, and no slough or necrotic tissue. The skin often looks shiny and macerated where moisture has been held against it.
Pressure injuries tend to have more distinct margins and can extend deeper, from non-blanchable erythema through partial-thickness loss to full-thickness damage involving fat, muscle or bone. Slough or eschar, depth and undermining point towards pressure. Moisture damage should not be staged as a pressure injury, because staging describes pressure-related tissue loss.
Recognise the overlap that causes misclassification
The two conditions often occur in the same person. Incontinence weakens the skin and makes it more vulnerable to pressure and friction, and immobile, incontinent clients are at risk of both. Superficial pressure injuries and moisture damage can look similar, and misclassification is a recognised problem in practice.
No single feature settles every case, so combine location, appearance, history of incontinence and mobility, and how the area responds once moisture is controlled. If moisture damage fails to improve with good continence care, or deepens, reassess for pressure. Uncertainty should be documented and referred to a wound or tissue viability specialist according to local policy.
Match the care plan to the cause
Moisture damage is managed by removing the irritant and protecting the skin. That means prompt, gentle cleansing after each episode of incontinence with a pH-balanced cleanser, patting rather than rubbing, applying a barrier product, and reviewing pads and the cause of incontinence or diarrhoea. Repositioning helps, but continence care drives healing.
Pressure injury care centres on offloading: a repositioning schedule, pressure-redistributing support surfaces, heel elevation, attention to devices and shear during moves, plus nutrition support and wound care appropriate to the stage. Using a barrier cream alone on a pressure injury, or turning schedules alone on moisture damage, misses the main cause.
Apply the differences to a hypothetical skin assessment
Imagine a hypothetical bedbound client with diarrhoea who has diffuse, shiny redness with small erosions across both buttocks and the cleft, with irregular edges and no slough. A student suggests documenting it as a stage 2 pressure injury. The options are to agree, document moisture damage and start continence care, or wait for specialist review.
Documenting suspected incontinence-associated dermatitis and starting cleansing and barrier protection is the strongest response, because the location, diffuse shape and superficial appearance fit moisture damage. Repositioning continues, since the client remains at pressure risk. The nurse reassesses regularly and escalates if the area deepens or develops defined edges over bone.
Sources and further reading
Incontinence-associated dermatitis and pressure injuries (International Wound Journal, via PMC). Differences in location, cause, edges, depth and presentation, frequent misclassification, and moisture-focused versus pressure-focused management.
MSD Manual Professional: Pressure Injuries. Pressure, shear, friction and moisture as causes, common bony locations, staging and prevention through repositioning, support surfaces and moisture control.
The next step on this is the same as on everything else here: answer questions and read the rationales. Our basic care and comfort practice questions are the closest set to what this page covers.
One question from the basic care and comfort set
A nurse is preparing to feed a client who had a stroke and has mild dysphagia. Which action best reduces the risk of aspiration?
Rationale
Upright at 90 degrees with a chin tuck narrows the airway entrance and directs the bolus toward the esophagus — it is the single highest-yield positioning intervention for dysphagia. Thin liquids and straws move fastest and aspirate most easily, side-lying removes the gravity you want, and large bites overwhelm a swallow that is already impaired.
Answer: B
Common questions
Can incontinence-associated dermatitis be staged like a pressure injury?
No. Staging describes pressure-related tissue damage. Moisture damage should be documented as its own condition, although a client can have both at the same time.
What is the clearest visual clue to moisture damage?
Diffuse redness with poorly defined, often patchy edges in areas exposed to urine or stool, such as the perineum and gluteal cleft, rather than a defined lesion over a bony prominence.
Does moisture increase the risk of pressure injury?
Yes. Prolonged moisture softens and weakens skin, making it more vulnerable to pressure, shear and friction, which is why continence care is part of pressure injury prevention.