Newborn rash?

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My baby is 6 weeks old. And has had this pretty gnarly rash all over her face and neck for about 2 weeks now. I figured it was baby acne but I don’t remember it lasting this long with my first. I’m exclusively breastfeeding and have a fear that I’ll have to change my diet. It’s only on her face and neck though which makes me think it’s not a food issue? Is this just bad baby acne or does it look like something else?