Itchy rash?

Kayleigh • 👧🏼💝 01.12.16 👶🏼💙 19.11.18

Anyone know what this could be? It’s like brown, scaly and itchy and it’s started to come on the back of my neck. It’s under my breasts which is the photo.

I see my midwife Monday so will ask her then too.

I’m 37w3d.