What could this be?

Ashely • Mommy of four! 3 boys & 1 girl🤍

It’s on his back , neck and a little on his face.

He had a fever a few days ago, but I figured it was teething since his canines and molars were cutting through. He’s had the rash since yesterday, I was told to try Benadryl and it didn’t make much of a difference. any ideas what it could be? have an appointment tomorrow! Also could it be eczema? I have had it my entire life. I figured he could’ve inherited it as well