Mommas/nurses help! What’s this RASH?

Andrea 👼🏽👼🏽🌈🎀

My 1 yr old was constipated lastnight and had a crying fit and got a little sweaty so I assumed the rash was. Heat rash. Well now it’s even worse today. Does this look like heat rash or hives?? Its on her back Chest stomach neck and back of neck. It’s also on her forehead a little and she keeps rubbing her forehead and itching in her ears. Too late for Dr visit so I may end up taking her in the morning! Any opinions?

Lastnight

Right now