What causes acute eczema?

How is acute eczema caused? In clinical practice, he has two reasons: one is divided into external factors, and the other is internal factors. 1, external factors are mainly in food, more common are fish and shrimp. In inhalation, such as pollen, dust full wool, etc. There are microorganisms, such as surface pyogenic cocci and superficial fungal infection. Living environment, such as sunlight, heat, dry, all kinds of animal fur, dander and a variety of chemicals, such as cosmetics, soap synthetic fibers. 2, internal factors, such as the chronic infection focus, such as chronic cholecystitis, tonsillitis, intestinal parasites, endocrine and metabolic changes, such as menstrual cycle, pregnancy and other factors, blood circulation disorders caused by small leg varicose induced leg eczema, neuropsychiatric factors are closely related to the occurrence of this disease, mental factors such as excessive tension and fatigue can rise.