Suddenly itching a lot of red bumps on the body, may be hives, insect bite dermatitis, scabies and other factors. It is recommended to detach from the environment, medication and so on. 1. Urticaria: Urticaria is an allergic skin disease, the cause is complex, mainly manifested as skin tingling, erythema with itching. Antihistamine drugs such as loratadine hydrochloride and cetirizine can be given. In severe cases, cortisone and epinephrine can be injected. 2. Insect bite dermatitis: often in and out of parks, jungles and other external environments, mosquito bites, resulting in red bumps on the skin with itching. It is recommended to get out of the environment, oral stavudine hydrochloride tablets, loratadine tablets and other antihistamines can help to quickly relieve the symptoms. Can also be combined with topical glycerine lotion, zinc oxide ointment, etc. to stop itching. 3. Scabies: It is an infectious skin disease caused by scabies mites parasitizing the skin. Mainly manifested as scattered distribution of papules, papules, tunnels and other skin lesions manifestations, accompanied by intense itching. At this time, you need to give insecticides such as sulfur ointment, benzyl benzoate emulsion and so on. At the same time, we should pay attention to personal hygiene, intimate apparel, bed sheets and covers should be changed and disinfected in a timely manner, and avoid sharing personal items with others. Itchy body, a lot of red bumps, there may be other reasons, it is recommended to go to the hospital in time to find out the cause of the symptomatic treatment, drugs need to be used as prescribed by the doctor.