A skin rash or eruption, especially one that appears suddenly and is associated with a disease or infection.
From Greek exanthema, from ex- (out) + anthein (to bloom). Medical term literally meaning 'blossoming out,' describing how rashes appear and spread on the skin.
Diseases like measles and scarlet fever were historically identified by their exanthems—the distinctive rashes that bloomed on the skin became the disease's signature, which is why doctors could diagnose these conditions just by looking at the pattern and color of eruptions.
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