I just found this!

Cause. According to pediatrician William Sears, it is common for babies to get a facial rash when teething. Generally, you will notice a red, raised rash that appears around his mouth and on his chin, lips, neck or chest. The rash is caused by excess saliva stimulated by the teethingprocess.

@tiredallyear he's almost 10 months!

yea. I think rashes are pretty common with teething. How old is he?

@tiredallyear thanks! My son has has it since yesterday and has all the signs of teething. Restlessness, drooling, biting on everything, runny stool.

@mamaash my son is light skinned too and he woke up from a nap yesterday with rosy cheeks that have gotten brighter. He has his 2 bottom teeth so I think it might be the 2 top ones coming in.

he's also light skinned and has them period but now his cheeks look more rosy

my son always got red rashly cheeks when he started teething. but it went away pretty quick

my son has super red cheeks right now