Milk protein allergy is a type of food allergy, and its clinical manifestations involve several systems. First of all, the skin symptoms, especially in infancy, are mainly manifested as eczema, commonly known to the common people as milk fungus. This manifestation is the most common, and hives may also appear. Secondly, there are digestive symptoms, mainly diarrhea, vomiting, and even severe milk spillage. When it comes to food allergies, the younger the baby is, the more likely it is to have digestive symptoms. Especially in infants under 6 months of age, it is entirely possible for a food allergy to show only digestive symptoms and no skin symptoms. Once again, there are respiratory symptoms, mainly coughing and wheezing. What we must beware of is that often when we talk about food allergy, it is associated with eating, as if eating is the only way to be allergic. But it is entirely possible for food to cause allergies without going through the eating route. For example, when we cook some plants, the proteins in them can diffuse into the air with water vapor and cause allergies through inhalation. Finally, one particular manifestation of food allergy is oral allergy syndrome. It is the edema of the mouth, tongue, lips, and in severe cases, the entire face, after exposure to specific foods. In addition, allergy can also cause anaphylaxis or laryngeal edema, which is a more serious food allergy, and milk protein allergy can also be caused, so I hope you will pay attention to it.