blister
Enable an agent to recognise a suspected skin or mucosal blister, record its condition and possible causes, and identify what evidence is needed before choosing an action.
Research draft, second pass
A second pass drafted this model: the structure a model of this thing needs, and what is known about it in the world. The line under this one says how the second half was obtained - researched against sources, or recalled without web access, in which case nothing here was read anywhere and every claim is a lead to verify. Unreviewed either way.
recalled by Codex without web access - no source was read
Researched by: Codex
Purpose and description
Enable an agent to recognise a suspected skin or mucosal blister, record its condition and possible causes, and identify what evidence is needed before choosing an action.
A skin blister is a localized fluid-filled elevation formed by separation within the epidermis or between the epidermis and underlying tissue.
It can be Document a suspected blister using site, dimensions, fluid appearance and covering integrity.; Compare successive observations for enlargement, rupture, resolution or new neighbouring lesions.; Associate the blister with possible friction, injury or exposure while retaining competing explanations.; Link individual blisters into a cluster or eruption without losing lesion-level observations.; Identify missing evidence and route uncertain or concerning presentations for appropriate assessment.; Record protective measures and subsequent changes against an applicable care plan..
Distinguishing features
An intact blister presents as a localised fluid-containing elevation beneath a surface covering; a solid elevation requires a different lesion classification.
A ruptured blister may present as an erosion with residual covering, so recognition may depend on earlier observations rather than its current appearance alone.
Record whether fluid appears clear, blood-containing or pus-like instead of treating every fluid-containing lesion as the same lesion type.
Distinguish a blister from a deeper swelling by recording whether a superficial fluid cavity and covering are actually observable.
Distinguish the individual blister from the disease or exposure that may have produced it; appearance alone does not establish its cause.
Scope
+ Individual suspected blisters and their membership in a local cluster or wider eruption
+ Fluid content, surface covering, dimensions and anatomical location
+ Intact, leaking, ruptured and healing lesion states
+ Associated symptoms and effects on movement or daily activities
+ Evidence connecting the lesion to friction, injury, exposure or an underlying condition
+ Observations needed to support assessment, protection and follow-up
- Blister packaging and its manufacturing specifications
- Blistering defects in coatings, materials or manufactured surfaces
- Complete models of burns, infections or blistering diseases
- General skin anatomy and wound-healing physiology
- Prescribing medication or independently diagnosing an underlying disease
Characteristics
- Anatomical site
- Named skin region or mucosal site, with laterality Location affects interpretation, exposure hypotheses and functional consequences.
- Lesion dimensions
- Maximum length and perpendicular width in mm, with observation time Supports comparison over time and application of an explicitly named size classification.
- Surface covering integrity
- Intact, leaking, partly detached, absent, uncertain Separates a closed fluid cavity from an exposed lesion and changes what can be observed.
- Visible fluid appearance
- Clear, cloudy, blood-containing, pus-like, mixed, not visible, uncertain Preserves an observation without converting appearance into an unsupported diagnosis.
- Covering tension
- Tense, flaccid, collapsed, indeterminate Captures morphology that may inform subsequent assessment.
- Associated symptoms
- Pain, itch, burning or altered sensation; severity and timing recorded separately Connects the lesion to discomfort, change over time and impaired activity.
- Surrounding tissue appearance
- Observed colour change, swelling, skin breakdown or no visible change, with uncertainty Distinguishes the blister cavity from changes in adjacent tissue.
- Eruption membership
- Isolated lesion or member of an identified cluster or eruption Prevents observations about one blister from being confused with the distribution of many.
- Suspected cause
- Linked exposure, injury or condition, with supporting evidence and confidence Keeps causal hypotheses separate from established observations.
- Temporal course
- New, enlarging, stable, leaking, ruptured, resolving, recurrent, unknown Makes progression and recurrence visible across observations.
Also called
Where this came from
wikidata · CC0 1.0
Also registered as vr.tr.blister
Drafted structure
Bundle to layer to finding to question, as the second pass will find it: 6 bundles · 11 layers · 16 findings · 26 questions.
Blister identity Establish whether the observed lesion fits the intended meaning of blister.
The registry lacks a definition, and both the word's meaning and the lesion classification require explicit boundaries.
Meaning and tissue
Identify the sense of blister and the affected tissue.
Cutaneous or mucosal sense
Record whether this entry concerns a lesion on skin or mucosa and what supports that interpretation.
- Does the originating registry record identify a skin or mucosal lesion rather than packaging or a material defect? provenance
- Which anatomical tissue and site contain the suspected blister? definition
Lesion boundaries
Separate a blister from neighbouring lesion categories.
Fluid cavity evidence
Preserve the evidence for a superficial fluid-containing cavity, including evidence available before rupture.
- What observation supports a fluid-containing cavity rather than a solid elevation or deeper swelling? boundary
- If only an erosion remains, what earlier observation supports identifying it as a ruptured blister? provenance
Cavity and covering Describe the fluid cavity and the surface that contains it.
Fluid appearance and covering integrity distinguish blister states that size alone cannot capture.
Dimensions and fluid
Record measurable extent and visible contents.
Cavity description
Capture dimensions and fluid appearance with observation limits.
- What are the maximum length and perpendicular width in millimetres, and when were they measured? measurement
- Is the visible fluid clear, cloudy, blood-containing or pus-like, and how certain is that observation? measurement
Covering condition
Describe whether the blister retains its surface covering.
Integrity and tension
Distinguish tension of an intact covering from leakage, detachment and exposure after rupture.
- Is the covering intact, leaking, partly detached or absent? measurement
- If intact, does the covering appear tense or flaccid; if ruptured, what surface is exposed? measurement
Distribution and cause Connect local lesion observations to distribution and possible causal context.
An isolated blister at a contact point and multiple unexplained blisters require different evidence, without either pattern proving a cause.
Lesion pattern
Locate the blister within an isolated, clustered or more extensive presentation.
Site and companions
Record the lesion's site and relationship to other affected areas.
- Is this blister isolated, clustered with others or part of an eruption affecting separate sites? measurement
- Does its location correspond to a reported contact, rubbing or exposure area? boundary
Causal evidence
Represent explanations as evidence-supported hypotheses.
Trigger and alternatives
Keep reported triggers, timing and alternative explanations distinguishable.
- What friction, injury, exposure, illness or medication change was reported before onset, and by whom? provenance
- What evidence supports the proposed cause, and which competing explanations remain unresolved? boundary
Course and burden Track how the blister changes and how it affects the person.
A single image cannot establish progression, recurrence or the practical burden of a blister.
Lesion evolution
Maintain the timeline from first detection through rupture or resolution.
Change and recurrence
Distinguish changes in the same blister from formation of new lesions.
- When was the blister first noticed, and how have its size, contents and covering changed? measurement
- Does apparent recurrence concern the same location after healing or additional blisters elsewhere? boundary
Symptoms and function
Record discomfort and site-specific interference with activity.
Experienced burden
Capture reported symptoms separately from observed activity limitations.
- What pain, itch, burning or altered sensation is reported, and is it changing? measurement
- Does the blister interfere with walking, gripping, eating or another activity associated with its location? measurement
Assessment and care context Record the evidence and care context needed to decide what may happen next.
The agent must distinguish documenting a blister from having enough information to recommend or perform an intervention.
Assessment needs
Identify uncertainty and accompanying changes relevant to review.
Review-relevant context
Record surrounding tissue changes, broader symptoms and applicable assessment criteria without inferring a diagnosis.
- What surrounding tissue changes, additional lesions or broader symptoms accompany this blister? measurement
- Which applicable clinical guidance determines whether its site, progression or person-specific context requires assessment? action
Intervention record
Connect any care measure to its rationale and observed result.
Care and response
Record protection, exposure reduction or other interventions without embedding an unsupported treatment protocol.
- What protective or other care measures have been taken, under whose guidance, and was the covering altered? provenance
- What follow-up observation will establish whether discomfort, integrity or surrounding tissue condition has changed? action
Evidence and external alignment What the world already says about this thing, gathered so the model can be checked against it.
A model that cannot be lined up against existing standards, identifiers and practice cannot be adopted by anyone who already uses them.
Reported evidence
Findings from the breadth pass, kept separate from the structural claims.
Check these first
Recalled without web access and unsourced; every item is a lead to verify.
- The skin-lesion sense is assumed because no sense is recorded; blister also names raised defects in materials and packaging cavities.
- The listed kinds mix causes and contents and are not mutually exclusive.
- Check the intended dermatological convention before fixing the vesicle-bulla size threshold.
- Which of these check these first hold for the sense of blister this model covers, and on what evidence? provenance
Kinds and varieties
Recalled without web access and unsourced; every item is a lead to verify.
- Friction blister
- Burn blister
- Blood blister
- Blister associated with contact dermatitis
- Infection-associated blister
- Blister associated with autoimmune blistering disease
- Which of these kinds and varieties hold for the sense of blister this model covers, and on what evidence? provenance
Real-world use
Recalled without web access and unsourced; every item is a lead to verify.
- Blister morphology and distribution help clinicians distinguish mechanical injury, inflammatory disease and infection.
- Blister occurrence is used to assess footwear fit and friction-related skin injury.
- Blister formation contributes to clinical assessment of some burns.
- Which of these real-world use hold for the sense of blister this model covers, and on what evidence? provenance
Typical measurements
Recalled without web access and unsourced; every item is a lead to verify.
- Lesion diameter - Variable; vesicles are smaller and bullae larger, with terminology commonly using a 5 or 10 mm dividing threshold. - mm
- Which of these typical measurements hold for the sense of blister this model covers, and on what evidence? provenance
Failure modes and hazards
Recalled without web access and unsourced; every item is a lead to verify.
- Rupture can expose an erosion and compromise the skin barrier.
- Secondary infection can complicate a blister or its exposed base.
- Pain can limit walking or manual activity.
- Extensive blistering can cause substantial fluid loss and accompany serious underlying disease.
- Which of these failure modes and hazards hold for the sense of blister this model covers, and on what evidence? provenance
Neighbouring kinds and how to tell them apart
Recalled without web access and unsourced; every item is a lead to verify.
- vesicle - A vesicle is a small blister; the size cutoff varies between references.
- bulla - A bulla is a large blister; the size cutoff varies between references.
- pustule - A pustule contains purulent material rather than predominantly clear or bloody fluid.
- wheal - A wheal is an elevation caused by dermal edema, without a discrete fluid-filled cavity.
- blister pack - A blister pack is packaging with formed cavities, rather than a skin lesion.
- Which of these neighbouring kinds and how to tell them apart hold for the sense of blister this model covers, and on what evidence? provenance
What the second pass must settle
- Does the registry's original source confirm that blister denotes a skin or mucosal lesion rather than another sense of the word?
- Which clinical terminology source should govern the boundaries between blister, vesicle, bulla and pustule, including size conventions?
- Should a ruptured blister remain an instance of this model throughout healing, or transition to a linked erosion or wound model?
- Which authoritative guidance should govern assessment and care decisions for different sites, causes and person-specific circumstances?
- Does an existing Vercy world model already own this concept or the eruption-level structure to which individual blisters should link?