Skin Barrier Functions

The functions of the skin to prevent external stimuli and foreign substances, such as allergy-causing substances, bacteria, and viruses, from entering the skin and to prevent evaporation of water from the body are referred to as the skin barrier function.
The skin of atopic dermatitis is naturally prone to dryness, and because the skin barrier function is impaired, it is unable to prevent foreign substances from entering the skin, causing inflammation, itching, eczema, and other symptoms.