Hello… I have a question for you, my daughter was born on September 10…

Hello… I have a question for you, my daughter was born on September 10th, already three days ago spots appeared on her face, it looks like acne… Who knows what this is? Maybe an allergy to something? Has anyone had this? P.S. I don't eat anything about nutrition, I keep a diet, soups, meat, fish and all… Sometimes we give "Nan" mixture at night when the baby isn’t eating enough… Could be an allergy to the mixture? Can you please suggest something ?? We will go to the pediatrician next week only.