Red bumps on the face and body and itchy may be caused by insect bite dermatitis, urticaria, neurodermatitis and other causes. 1. insect bite dermatitis: when the face, body and other parts of the mosquitoes, fleas, body parasites bite, in addition to leading to local skin itching, red bumps of the symptoms, but also lead to local skin ulceration, pus and other phenomena. 2. Urticaria: When allergic body inhales or comes into contact with allergens, urticaria is easy to occur. It causes the skin on the face, body and other parts of the skin to appear airy red spots, accompanied by obvious itching symptoms. 3. Neurodermatitis: The disease is a chronic inflammatory skin disease, such as environmental changes, mental stress and other factors, can cause neurodermatitis. When suffering from neurodermatitis, in addition to the face, body and other places of the skin pimples, erythema and other symptoms, can also lead to obvious itching symptoms. When there are red bumps on the face and body and itchy, you should avoid scratching the itchy place, so as not to break the affected area, triggering infection. If the symptoms are serious, it is recommended to go to the hospital in a timely manner, to clarify the cause of the disease, under the guidance of the doctor for targeted treatment.