Atopic dermatitis is an allergic skin disease with a genetic predisposition, which manifests itself as recurrent eczema and rash starting from early childhood until adulthood, which persists and is related to food, medication, and mental factors, such as mental stress or eating certain medications or certain allergy-inducing foods, which aggravate the rash. Due to recurrent attacks, rash symptoms appear all year round, and also due to repeated scratching resulting in localized skin thickening, i.e., mossy changes, and localized skin pigmentation can occur. The most common site of dermatitis is the elbow fossa, and also the popliteal fossa, and other people have some special sites, such as eczema on the hands. Eczema is divided into an acute phase and a chronic phase, sudden acute eczema attack, the whole body rash will have exudation, redness and swelling, belong to the acute inflammation, acute phase combined with infection will appear skin redness and swelling, septic exudation.