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Use "reddening" in a sentence
"At the exposure levels that we are talking about, the worst is that you could have short-term reddening of the skin."
"If a person has any reactions to their medicines, such as reddening of the eyes, unusual itching or widespread rash, they should stop taking the medicines and return to the health care worker who prescribed them as soon as possible."
"Nobody should ever stop taking their medicines, even if they feel better, unless instructed to do so by a health care worker, or unless the side-effects described below, such as reddening of the eyes, unusual itching or a widespread rash, appear."