Differential Diagnosis
> Morphology >
Reaction Patterns
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Dermal
> Deposition
Deposition
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materials:
•
amyloid
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mucin
•
lipids
•
calcium (osteoma cutis)
•
urate
•
colloid (e.g. colloid milium)
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hyaline material (e.g. lipoid proteinosis)
•
tattoos
•
porphyrins (though not a “dermal” presentation)
•
and always think about granulomatous or lymphocytic infiltrate (i.e. other dermal)