Atopic dermatitis is also known as atopic dermatitis and genetic allergic eczema. A significant proportion of so-called “tinea cruris” and “pediatric eczema” are actually atopic dermatitis. These children usually have a family history of allergic diseases. Once atopic dermatitis is diagnosed, the child is significantly more likely to develop certain allergic diseases, such as asthma, allergic rhinitis, and conjunctivitis. The disease usually has a long course, usually starting in the second or third month of life, and most of it resolves within 2 years of age, but a few can last for life, and in severe cases it can even affect the child’s growth and development. Whether it is atopic dermatitis, a preliminary judgment can be made based on the following: 1. chronic recurrent skin eczema since infancy and early childhood, usually begins to occur on the face, later spreading to the trunk extremities, body, limbs, especially the joint areas, severe redness, oozing, scalp sometimes crusted yellow. 2. Itching during eczema attacks, which affects sleep. 3. Dry skin. 4. Have asthma or allergic rhinitis (sneezing, runny nose and itchy nose not related to cold), or have asthma or allergic rhinitis in family members. If more than one of the above conditions are met, atopic dermatitis should be highly suspected.