Skin rash?

Kristina • Baby Savannah due 12/12/19

My daughters 4mo. and has developed a rash on her abdomen. We have a virtual appointment at 2pm today but I’m a little panicked... has anyone experienced anything like this? A few things to note...

-I did change laundry detergent but it was still “free and clear”. I bought the old brand and washed everything again just to rule that out.

-No allergies that we know of, no changes in formula recently (she’s on her 6th can of this type)

-It started yesterday but was mild so I gave her an oatmeal bath and put on eczema cream. Next day it doubled and was redder.

Any help would be much appreciated! Thanks