Children always forehead itch can be considered to be contact dermatitis, eczema, urticaria, seborrheic dermatitis and other diseases caused. 1. Contact dermatitis: if contact with sensitizing or irritating substances, it may cause local skin itching, redness and swelling and other allergic reactions. Such as contact with animal fur, plants, flowers and fruits, chemicals (chemical detergents, cosmetics, chemical raw materials, etc.), food allergens, drug allergens, etc.; all of the above factors can cause local skin allergies, and then itching and other symptoms. 2. Eczema: This disease is mostly related to genetic, autoimmune, environmental and other internal and external factors. In addition to itchy skin, if the forehead skin has erythema, edema, papules, papules, blisters, vesicles, oozing and other symptoms, it can be considered eczema. 3. Urticaria: This disease is mostly related to food and drug allergies, infections, autoimmunity and so on. If the itchy area shows the symptoms such as hives and/or angioedema, then it can be considered as urticaria. 4. Seborrheic dermatitis: this disease often occurs in the head, face, chest and back and other seborrheic areas, mainly manifested as erythematous rash, with greasy scales or scabs on the surface, often accompanied by varying degrees of itching. Therefore, the itching sensation on the forehead of the child may also be caused by this disease. Parents are advised to take their children to regular hospitals for consultation, to clarify the cause of the disease, and then follow the doctor’s instructions to receive treatment.