The reasons why children’s faces are always red include physiological factors, allergic dermatitis, mitral stenosis and so on. 1. Physiological factors: if the outside environment is too high temperature or in the plateau, then there can be redness of the face, these physiological phenomena do not need to worry. 2. Allergic dermatitis: if the patient is allergic to pollen and other substances, then the redness of the face will also occur after triggering an allergic reaction. 3. Mitral stenosis: If the patient has mitral stenosis, the blood will pool due to the obstruction of body circulation, so the face will be red. There are other reasons why a child’s face is always red. After eliminating physiological factors, children always red and accompanied by other uncomfortable phenomena, please consult a doctor in time.