Girls, can you please tell me if it's possible for a child to have an …

Girls, can you please tell me if it's possible for a child to have an allergy to breast milk? (I'm already on a dairy-free diet), We have atopic dermatitis, nothing helps, all of the child's face is in crusts, cream, I wash with household soap, I follow the diet, I bathe every other day, and also make compresses, but everything just gets worse. ??‍♀️ Doctors constantly change creams, but there's no point.