She does have sensitive skin like she can only use specific brand diapers and such

This happened a lot at my daycare. I assume she isn't allergic. But one of my students started getting red around his lips after he ate. He had really sensitive skin and one thing that we did was put cream on it and clean his face every time he ate. It could just be skin irritation. I've never seen it turn into anything serious. But if it continues going to the doctor would be best just in case it's a rash. Does your baby have eczema? Or sensitive skin?