Relating to or characterized by erythema; producing or causing redness of the skin.
From erythema combined with the adjectival suffix -al meaning 'relating to' or 'of the nature of.' This descriptor emerged in medical terminology to modify nouns related to erythema conditions.
UV rays cause erythemal damage by triggering blood vessel dilation—sunburn is fundamentally an erythema response, and dermatologists use 'minimal erythema dose' to measure how much sun exposure causes visible redness!
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