Rash on Neck 24 weeks pregnant

Friday, I was laying down and realized my neck was itchy. I quickly realized it wasn’t a normal itch and looked in the mirror and had this rash. It literally prob developed within an hour or so.

It seems to be getting slightly better, but it still def itches. I am 24 weeks pregnant. I feel fine, I haven’t had any swelling/inflammation anywhere else, and it hasn’t spread at all. I have a routine prenatal apt on Tuesday AM so I’m def bringing it up then but I was wondering if anyone experienced anything similar?

I can’t think of anything new I’ve eaten or used, but the night before I did use some dry shampoo (the kind I’ve always used) and noticed it made my head slightly itchy but no bumps or anything like that. I’m just getting paranoid bc I looked up rashes on here and saw a story of placenta detachment due to inflammation and a rash, and I also saw another post about cholestasis of pregnancy (liver failure) and itchy rashes, so now of course I’m panicking.