A new rash type thing? 😰

Ma

So I noticed today during my LO's bath she had some red dryish patches on her back. They feel a little rough, but don't seem to bother her at all. I'll probably be calling the pediatrician tomorrow if it's not any better, but wanted to see if anyone had any ideas?

Nothing has changed in her routine or soaps or detergents or diet, so I'm at a loss.