[12.1.2] The abnormal redness due to an over-accumulation of blood in the capillaries of the skin. Ultraviolet-induced erythema is due to actinic action and is a delayed effect occurring several hours after exposure. This differs from infrared-induced erythema, a thermal effect occurring only for the duration of time that the skin temperature is elevated.

Note: The degree of erythema is sometimes used as a guide to dosages applied in ultraviolet therapy.

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