Sudden and itchy bumps on the body may be caused by atopic dermatitis, folliculitis, scabies, urticaria and other causes. 1. Allergic dermatitis: it may be caused by contact with allergens such as drugs, paints, plants and pollen. Patient lesions often start with itchy skin, followed by red spots and wind bumps. That is, the symptoms of pimples and very itchy. 2. Folliculitis: its cause is related to the body immunity, infection and other reasons. Patients with skin lesions can appear locally red, swollen, hot, painful inflammation of small nodules, can gradually enlarge the cone, that is, the body suddenly goosebumps and very itchy symptoms. 3. Scabies: caused by the human scabies mite parasites in the human body, mainly through close physical contact, or sharing bedding with the infected person is spread. Patients can appear between the fingers, wrists, lower limbs and other places pimples, that is, pimples. The skin is often intensely itchy and worse at night. 4. Urticaria: a common allergic disease, mainly manifested as generalized or localized patches of wind, and presenting edematous elevation of the skin surface, characterized by sudden appearance, and gradually subside after a few minutes or hours. Sudden bumps on the body and itchy patients can also be seen in other diseases, it is recommended to go to the hospital in a timely manner, clear the cause of the disease and follow the doctor’s instructions for treatment, to avoid delaying the condition.