What could this be??

Sara • Happily Married 11-28-15👩‍❤️‍👨 Mommy to Leah Marie 5/9/19👧🏽 Trying for baby #2🤰🏽

I gave my daughter a bath and after I put on lotion like I always do, will I had her laying on a her mat and I noticed her cheeks red but her right side is more red.