Good evening moms Can you tell me what this rash is around the mouth? …

Good evening moms Can you tell me what this rash is around the mouth? It's only around the mouth, not on other places. The pediatrician said "something she ate probably" and that it's an allergy She gave fenistil, but it didn't go away. Sometimes it goes away by itself and then reappears The baby is 3 months and 2 weeks old