erythema
Let an agent explain erythema in general terms, relay causes, patterns and associated conditions from dermatology sources, route warning signs to urgent care, describe the named patterns, and distinguish erythema from flushing, purpura, rash as a broader term and cellulitis, without diagnosing individuals.
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.
written by Claude from model knowledge without web access - no source was read, every claim is a lead to verify
Researched by: Claude
Purpose and description
Let an agent explain erythema in general terms, relay causes, patterns and associated conditions from dermatology sources, route warning signs to urgent care, describe the named patterns, and distinguish erythema from flushing, purpura, rash as a broader term and cellulitis, without diagnosing individuals.
Redness of the skin or mucous membranes caused by increased blood flow in dilated superficial capillaries, a sign of many conditions including inflammation, infection, sunburn, allergy and drug reactions, with patterns the registry aliases name such as palmar erythema, seen in liver disease and pregnancy, necrolytic migratory erythema, associated with glucagon-secreting tumours, erythema annulare centrifugum, with expanding rings, niacin flush, a harmless but uncomfortable reaction to nicotinic acid, keratolytic winter erythema, an inherited peeling condition described in South Africa, and mercurial erythema from mercury exposure; the registry files it under flushing, which is a related but narrower transient sign. Rapidly spreading redness with fever, blistering, peeling or mucous membrane involvement needs urgent medical care.
What it is for: Not applicable; a clinical sign.
It can be explain causes and mechanism; relay associated conditions; describe named patterns; route warning signs.
Distinguishing features
Blanching redness
Many causes
Distinctive patterns
Sign rather than disease
What it looks like
Red or pink skin that blanches when pressed, sometimes warm or in rings or patches.
Physical character
blanching test: erythema fades under pressure note - purpura does not
minimal erythema dose: UV dose causing just perceptible redness note - phototesting
registry parent: flushing note - narrower related sign
How it is recognised
Skin redness from dilated capillaries
Necrolytic migratory erythema, erythema annulare centrifugum, palmar erythema, niacin flush, keratolytic winter erythema, mercurial erythema
Flushing is transient facial redness; purpura does not blanch; rash is a broader term; cellulitis is a deeper infection with swelling
Related models
is related to - registry parent
is a sign of -
includes -
is contrasted with -
In practice
Families and kinds
inflammatory erythema
infectious erythema such as erythema migrans
drug and toxic erythema
reactive erythemas such as erythema multiforme
physiological erythema
Standards and regulation
Dermatology clinical guidelines
Occupational limits for mercury exposure
Failure modes and hazards
Missing Stevens-Johnson syndrome or sepsis signs
Missing Lyme disease erythema migrans
Self-diagnosis from photos
Also called
Where this came from
wikidata · CC0 1.0
Also registered as vr.tr.erythema
Drafted structure
Bundle to layer to finding to question, as the second pass will find it: 4 bundles · 8 layers · 8 findings · 16 questions.
Understand What erythema is.
Science.
Definition
Definition.
Definition
Definition.
- Is redness spreading fast with fever, blistering, peeling skin, sore mouth or eyes, or breathing difficulty, in which case seek emergency care? boundary
- What is erythema, and how does it differ from flushing, purpura, rash and cellulitis? definition
Patterns
Named patterns.
Patterns
Patterns.
- What are necrolytic migratory erythema, erythema annulare centrifugum, palmar erythema, niacin flush, keratolytic winter erythema and mercurial erythema? definition
- Which entry fits the specific pattern? action
Mechanism Mechanism.
Science.
Vessels
Capillary dilation.
Vessels
Vessels.
- How does capillary dilation cause redness, and why does it blanch? provenance
- Which references are standard? provenance
UV
Sunburn erythema.
UV
UV.
- How is UV erythema measured with the minimal erythema dose? measurement
- Which sources are cited? provenance
Conditions Associated conditions.
Science.
Systemic
Systemic signs.
Systemic
Systemic.
- How can palmar erythema and necrolytic migratory erythema point to internal disease? provenance
- Which entry fits glucagonoma? action
Reactions
Drug and niacin reactions.
Reactions
Reactions.
- Why does niacin cause flushing, and which drug reactions are dangerous? provenance
- Which entry fits Stevens-Johnson syndrome? action
Context Care.
Attribution.
Care
When to seek care.
Care
Care.
- When do clinicians advise seeing a doctor about skin redness? provenance
- Is the information current? boundary
Genetics
Inherited erythema.
Genetics
Genetics.
- What is known about keratolytic winter erythema genetics, as researchers report? provenance
- Is the presentation neutral and attributed? boundary
What the second pass must settle
- Should the registry parent flushing be revised?
- Should each named pattern be a separate entry?
- How should dermatology image atlases be linked?