Eczema is strongly related to allergies, most often caused by allergies to milk, eggs, etc. The rash mostly starts on the face and can appear all over the body in severe cases, manifesting as rough skin with flaking, redness and swelling, and oozing in severe cases. The itchiness of the skin is obvious and infants often scratch with their hands. Check for possible allergic foods, with milk allergy being the most common. The mother should recall what new foods she ate before her child got eczema. If the eczema worsens after eating it, the mother should try to avoid it; for babies who eat formula, they should switch to amino acid or deeply hydrolyzed formula and switch to it for about 2 weeks, and the eczema will be reduced, then the milk allergy can be confirmed and should continue to be eaten for 3-6 months; for babies who add complementary foods, for each added food (such as egg yolk, mashed meat, etc.), watch and observe for 3 days to see if the child has an allergy to eczema. If there is an allergy, stop it in time and try to add it again after 3 months.