Hi, Welcome to HCM. This seems to be food allergy which causing your daughter s rashes or red face ans white spots over chest. Food allergy can be diagnosed only on the basis of detailed history taking and thoroughly clinical examination by an expert. Although there are laboratory allergic testing of food is being done nowadays but none of them is reliable clinically and also adds extra cost to the patient. The best way to cure allergy is to avoid contact of that particular allergen. But here if your daughter s allergic reaction has subsided by itself then there is no need to get panicked. In case,if this problems of rashes remains persistent or if she fell this frequently then,there are very good medicines like epinephrine,steroids, antihistamines, mast cell stabilizers are available in market to combat allergic symptoms. Consult dermatologist or allergic specialist if this problem remains longer otherwise no need to worry. Thanks.