the quality of being red in colour; used especially about skin that is sore or unhealthy

Her scar healed, but the redness remained for a long time. 伤疤愈合了，但是皮肤还是红了很长时间。

Severe peanut reactions can include redness and swelling of the face. 对花生的反应严重的可包括皮肤变红和脸部肿大。