The child’s body is always itchy for the following reasons: 1. It is possible that the child himself is allergic, and allergic urticaria occurs when he eats allergic food, touches dust and things that easily induce allergies, so his body is always itchy. This situation needs to be treated with desensitizing medication and avoid repeated contact with allergy-prone foods or objects. 2. It may be dermatitis due to contact, wearing uncomfortable clothes or clothes that are not made of cotton, which can cause special dermatitis or contact dermatitis in children after contact with the skin.