Eczema is prone to flare-ups in all seasons, because the etiology of eczema is complex, with the body’s own problems and the external environment, or food allergens, irritants, microorganisms, environmental temperature or humidity changes, sun exposure, etc., in each season may lead to eczema flare-ups for certain reasons, the specific reasons are as follows: 1, endogenous: endogenous factors in the body, including abnormal immune function and systemic diseases The reason for this is that the body’s internal factors include abnormal immune function and systemic diseases, such as endocrine disorders, nutritional disorders, chronic infections, and hereditary, or acquired skin barrier dysfunction, in addition to psychological anxiety, excess, and stress may trigger eczema. If the human epidermis is prone to symptoms of flaking, it may weaken the barrier function of the skin, making the skin more sensitive and more prone to eczema. 2, external factors: the rise in temperature is likely to cause bacterial growth, may induce eczema, which is more common in the spring and summer. When the humidity in the air is high, such as summer and autumn rainy season, will make the skin stimulated, which in turn causes eczema or prompt eczema recurrence. The sunlight and dry climate also have the potential to trigger eczema. The sunlight penetrates strongly in winter and the climate is dry and cold, so eczema can also occur in winter. Therefore, we should pay attention to avoid all kinds of suspected causative factors in our life, especially people who are allergy-prone, immunocompromised and suffering from systemic diseases, maintain good hygiene habits, keep warm, disinfect personal belongings on time to prevent bacterial growth, avoid allergy-prone foods to reduce the chances of allergy, and pay attention to moderate exercise, avoid staying up late, sun exposure, etc.