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Erythema is the physical sign of redness of an ectodermal structure like skin or the exocervix. It is caused by Hyperemia, which is the presence of increased blood flow to a particular structure.

Erythema is a physical sign, while Hyperemia is a physiologic process. Hyperemia can also occur in other parts of the body like in a myocardial infarct.

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Q: What is the difference between erythema and hyperaemia?
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What is the medical term meaning abnormal redness of the entire skin surface?

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