The causes of eczema in adults include the following: first, a large amount of food rich in protein, including milk, eggs, beef and mutton, seafood, etc.; second, excessive consumption of allergy-prone fruits, such as mango, durian, dragon fruit, kiwi, etc.; third, allergies caused by excessive exposure to ultraviolet light from the sun; fourth, due to serious medical conditions, such as chronic renal insufficiency, kidney failure or cirrhosis; fifth, due to heavy consumption of alcoholic beverages; sixth, due to secondary bacterial infections such as Staphylococcus aureus.