Eczema is a non-infectious inflammatory skin disease caused by a variety of internal and external factors. Its most typical clinical features include intense pruritus, a polymorphic rash, often symmetrical distribution, and a pronounced tendency to exude during acute attacks, while chronic onset or prolonged course of the disease is characterized by hyperplasia and hypertrophy. The mechanism of pruritus is still not completely clear, but the correlation between pruritus and eczema, an allergic disease, is unanimously recognized by the industry, especially in chronic eczema, where the rash is hypertrophic and infiltrative, the pruritus is very intense and the desire to scratch is strong, forming a vicious circle that is very easy to repeat. In contrast, in some eczema-like manifestations of acute eczema or heliodermatitis characterized mainly by exudation, itching can often be inconspicuous or masked by pain. Sometimes, because of individual variability, the intensity of pruritus feels different. Of course, it is not true that all itching is eczema. Non-eczema itching can occur during skin growth, such as when recovering from a surgical wound or when scar bumps expand, or when bilirubin is deposited in the skin, such as in pregnancy-related dermatitis, or unexplained itching, such as pruritus. Eczema and pruritus have some correlation, but the two are neither sufficient nor necessary conditions and cannot be directly equated. Moreover, scratching caused by itching can easily cause rash hypertrophy, skin breakdown, easily secondary to bacterial infection, difficult to heal, often aggravating eczema, patients should scratch less, to lightly pat or apply topical preparations to stop itching is better.