Rash on 4 year old

HELP RASH ON 4 YEAR OLD. what kind of rash is this? we noticed just some bumps on monday on her back. seems to be spreading everyday. a little itchy but not to the point where it’s driving her insane. took her to urgent care last night but they didn’t really have an answer. she has an appointment tomorrow with her regular doctor but thought i would see if anyone else has experienced this