Rash help!!

Jenelle

Anybody have any idea what this is or how to treat it? It doesn’t seem to be bothering her. I have been putting coconut oil on it and it has been there small for a while. But it’s now all of the sudden spreading and getting worse! I thought it was just a dry patch before :/

Sorry it’s really hard to get a good picture of it but it’s light pink and bumpy, all up her shoulder and a little on her back and arms.