Itching on both arms is considered to have the following conditions: i. Pruritus, which is an irritating reaction caused by overly dry skin and reduced sebum secretion from sebaceous glands, and can be treated with the application of glyburide lotion. Second, lichen planus, is due to genetic factors, metabolic disorder factors, immune disorder factors, drug stimulation factors, or hepatitis B virus infection and other factors. Common psoriasis is caused by genetic factors, trauma factors, bacterial infection factors, immune disorders and other factors. Fourth, drug dermatitis, is caused by drug allergy.