“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.”
“Even allowing for CPS charging standards (whereby a more serious s47 assault is charged as Common assault) 43 million quid is a lot of money to spend on incidents where the injury, more often than not, amounts to no more than "reddening"; and £234.97 is frankly a bargain when I think about the hours and hours I've spent taking statements, interviewing and speaking to the CPS.”
“More information:  The redshift value is a measure of the stretching of the wavelength or "reddening" of starlight due to the expansion of space.”
“These color variations are probably caused by the exposure of surface materials to the space environment, which leads to darkening and reddening.”
“He looked down and saw the snow reddening at his feet.”
““I think, of all people, you should know what I brought into this house, Kiera, when I brought Sasha here,” Mrs. March responded, her face reddening.”
“Jane sat between us, and we each rested a protective arm on her reddening shoulders.”
“His hand caressed the hilt of his sword, his face reddening.”
These user-created lists contain the word ‘reddening’.
... to use these words in spoken English and reap esteem. In the SPOKEN corpus of the COCA (full corpus: 450 million words) none of these occur.
Looking for tweets for reddening.