There are many causes of allergies in children, including food or exposure to allergens such as mites and dust, and the right measures need to be taken to eliminate them. A common cause of allergies in children is the consumption of allergenic foods. Many children have allergic reactions to certain ingredients in foods such as milk and chocolate and develop allergies after mistakenly consuming them. For mild symptoms, the food can be stopped immediately and the allergic local skin can be moistened and ointment applied. Those with more severe symptoms, spreading throughout the body or with obstructions to normal physiological activities such as swollen respiratory tracts, need to be treated promptly at a hospital and relieved with the help of a medical professional. Allergic children may also be allergic to foreign substances in the air, such as floating dust and pollen. The way to eliminate allergies is to clean up the air in the child’s environment, which can be done by using mite removers and vacuum cleaners as well as air purifiers to purify the air. The first thing to do after a child has an allergy is to eliminate the allergen so that the symptoms do not worsen. It is also necessary to take care of the allergic area, apply ointment or take anti-allergy medication, and pay more attention to diet and life. In severe cases, medical treatment is required. Children may have allergic reactions to food or certain items, and the allergens should be removed, treated and cared for according to the actual situation.