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erythematous

adjective

- relating to or characterized by erythema, which is the redness of skin as caused by dilation or congestion of capillary

In medicine, it is often used to describe skin redness caused by infection, massage, therapeutic application of ionizing radiation or ultrasound, allergies, sunburn, or by any of which that can increase blood flow as caused by the dilation of capillaries or irritation of surface capillaries.

Word origin: Greek eruthēma, from eruthainein, to redden, be red, from eruthros, red