Definition of "Erythema"
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Erythema (from Greek "erythros" meaning "red") is redness of skin (or mucous membrane).
Pathophysiology
Caused by hyperemia (increased blood flow) of superficial capillaries. It occurs in:
- Skin injury
- Infection
- Inflammation
- Hypercholesterolemia, just like how it causes spider nevi too
Dx
- Disappears on blanching (pressure). In contrast, hematoma/bleeding and pigmentation don't blanch
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