It is necessary to check the allergens of eczema, so that it is more helpful to clarify the triggers of the onset of the disease and to reasonably arrange treatment measures. Some eczema is caused by allergies, and if allergens can be identified, contact with them can be avoided to reduce the chance of recurrence; some eczema is caused by diseases, which can be promptly examined and treated for the cause. Common causes of eczema are various types of allergies, including food allergies, such as various seafood; inhalation allergies, such as pollen, dust mites, animal fur, etc.; and contact allergies, such as cosmetics, skin care products, soaps, etc. Some causes may also increase the risk of allergy and eczema, such as pregnancy, excessive fatigue, stress, thyroid disease, chronic infectious diseases, diabetes, etc. In short, if the allergen is not clearly identified, it is difficult for doctors to take effective measures in treating the condition and cannot guarantee the effectiveness of the treatment. Eczema may recur and the patient suffers, so it is necessary to do allergen testing for eczema.