Any ideas on what this is?

My 8 month old has had this rash for a little bit now and I thought it was just a drool rash. Didn’t think anything of it. Until tonight I picked her up from her grandmas after work and the rash wasn’t as bad and I got home and asked my husband to feed her while I was cooking dinner. After about 30 minutes I noticed the rash was considerably red and now I’m questioning if it’s an allergic reaction. I just don’t know what an allergic reaction to food looks like because she is my first baby. I also wasn’t around her while I was cooking dinner so I don’t know if she was drooling or what not while she was eating (which she probably was lol) I wanna add that she also has eczema so I’m not sure if that is contributing to the rash