Red bumps

Hey- already went to the pedi for this, so don't judge, but I don't think she's right- my babe has little red bumps around eyes and mouth only, sometimes cheeks. They come and go, but sometimes she wakes up and she looks really broken out. Pedi says its heat rash, but it just doesn't seem like it happens when shes hot. I'm wondering if she is allergic to something I'm eating, like cows milk. I've cut out dairy, it's only been a few days but it's not helping. It's not bothering her but it just sucks to introduce her to my friends and she looks like a hormonal teenager ! Any advice/experience?