Eczema is always recurring related to internal factors and external factors. 1. Internal factors: such as chronic infections, endocrine diseases, metabolic disorders, mental and psychological factors, genetic factors, etc., may make eczema recur. 2. External factors: such as taking allergy-inducing food (e.g. beef, mutton, fish and shrimp, etc.), or inhalation of allergens (e.g. pollen, dust, etc.), or the external environment of the temperature is too high, the air is dry, or contact with the allergens (e.g. animal fur, cosmetics, skin care products, soaps, etc.), are prone to eczema or aggravate the symptoms. Eczema is always recurring, you should go to the hospital for examination, to clarify the cause of the disease, actively remove the triggering factors, and follow the instructions to take appropriate treatment measures.