redness
n. 红；红色
例句
You may notice redness and swelling after the injection.
注射后会出现红肿。
《牛津词典》
Only occasionally did the telltale redness around his eyes betray the fatigue he was suffering.
只有在他眼周发红的时候才偶尔显出他有多么疲劳。
《柯林斯英汉双解大词典》
You get a rash, or a redness of the skin.
你会出皮疹，或者皮肤变红
