Redness of the skin caused by inflammation or dilation of small blood vessels, often a symptom of infection, injury, or allergic reaction.
Greek erythros 'red' plus the medical suffix -ema denoting a condition or state. This medical term directly translates the visual symptom—red skin—into clinical language used by physicians.
Your skin turns red when tiny blood vessels dilate to bring immune cells to fight infection—erythema is literally your body showing its defensive response, which is why fevers, allergies, and burns all cause this redness!
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