Children with itchy arm patches need to be treated according to the specific causes, such as urticaria, eczema, lichen planus, furunculosis, etc., after a clear diagnosis to take general treatment, medication and other ways. 1. urticaria: urticaria is common in children, will cause children’s skin to present wind mass, accompanied by itching, can show children’s arms into pieces of pimples itching phenomenon. Parents should avoid children’s contact with allergens, take anti-allergy drugs, such as loratadine, cetirizine and so on. If the itching symptoms are obvious, you can use glycerin lotion wet compress. 2. Eczema: The cause of eczema is more complex, and can also cause children’s arms into pieces of pimples itching phenomenon. Children can use Dinaid ointment, fusidic acid cream and other drugs to apply, if due to allergic factors, you need to take oral cetirizine hydrochloride and other anti-allergic drugs. 3. Linear tundra: Linear tundra may show conical papules in a linear distribution, with papules that do not fuse with each other, accompanied by itching. Children can use hydrocortisone butyrate ointment, mometasone furoate cream and other drugs to apply, if the itching is serious, with anti-allergy drugs, such as diclofenac tartaridine and so on. 4. Hairy erythematous chaff rash: Hairy erythematous chaff rash occurs in the arm, you can use halomethasone ointment for external coating, at the same time with oral compound glycyrrhizin capsules. There are many reasons why children’s arm pimples itch, after the symptoms, parents are advised to take children to the hospital in time to diagnose and treat the cause of the disease to give targeted treatment or treatment. All of the above drugs should be used under the guidance of a doctor, avoid self-medication.