It is not necessary to check allergens for infantile eczema, but it can be done to promote recovery from the disease. The etiology of infantile eczema is not yet completely clear, and it is mostly considered to be caused by environmental factors acting on genetically susceptible people, resulting in immune dysregulation. Generally the presence of parents with eczema, allergic rhinitis, asthma and other allergic diseases will significantly increase the incidence of infantile eczema. And frequent smoking or second-hand smoke during pregnancy also increases the risk of infant eczema. Meanwhile, if you add complementary foods to your child too early or over-clean the skin, etc., they may also trigger or aggravate infantile eczema. However, it is not necessary for the child to undergo allergen testing. As the cause of the disease is more complex, if the patient undergoes allergen testing, identifies the allergens and avoids them in a timely manner, it will be helpful for the recovery of the disease. Parents can choose to conduct allergen testing according to the specific conditions of the child. It is recommended that children with infantile eczema under the guidance of the doctor to carry out various tests, and actively cooperate with the doctor to carry out targeted treatment.