The cause of infantile eczema is not clear, it may be related to the external environment, abnormal skin barrier function, genetic factors, immune function. 1. External environment: for example, dust, pollen, animal dander, high temperature and so on in the external environment will easily induce eczema in infants. 2. Abnormal skin barrier function: skin breakage, excessive friction, irritation and other causes of skin barrier function abnormalities, easy to lead to perverse reactions, thus inducing infantile eczema. 3. Genetic factors: Infants with parents with chronic eczema, atopic dermatitis, allergic rhinitis, etc. have a higher incidence. 4. Immune function: abnormal immune function of infants is also prone to induce infantile eczema. Infant eczema needs to actively seek medical treatment and follow the doctor’s instructions.