Hello everyone. Can you tell me, girls, is this like food allergy? Onl…

Hello everyone. Can you tell me, girls, is this like food allergy? Only on the bottom of the baby's bum there are pimples on one side. And also in front of the underwear there is a small rash. We have never encountered allergies before. If it was somewhere else, I would definitely think about food allergy. (They started giving sweet stuff three weeks ago).