The main features of eczema include complex causes, polymorphic lesions, significant itching and recurrent episodes and so on. 1. Complex causes: eczema is a kind of allergic disease, also a kind of chronic inflammatory disease, and its causes are related to a variety of internal and external factors. For example, infection, endocrine abnormalities, mental factors and immune abnormalities and other internal factors; food, drugs and environmental factors and other external factors. 2. Lesions are polymorphic: the clinical manifestations of eczema are diversified, such as macules, papules, maculopapular rash, blisters, vesicles, peeling, dry cracks and thickening of the skin. 3. Significant itching; eczema is usually accompanied by intense itching, and itching symptoms can be aggravated after scratching, hot water scalding and drinking alcohol, and in severe cases, sleep is affected. 4. Recurrent: the disease is prone to recurrent episodes and prolonged. Due to individual differences in clinical manifestations, the specific situation needs to be analyzed by the doctor in conjunction with clinical analysis.