The skin is red and itchy, small bumps, may be related to allergic dermatitis, urticaria and other diseases, in the treatment of the main target to give anti-allergy treatment, at the same time as early as possible to improve the allergen test. 1. Allergic dermatitis refers to the allergic reaction after taking drugs, food or contacting certain chemical substances, you can follow the doctor’s prescription oral anti-allergy and anti-itch medication, such as loratadine tablets, chlorpheniramine maleate tablets and so on. Secondly, we must find out the cause of the allergy as much as possible to avoid re-exposure. 2. Urticaria is a kind of vascular metamorphic reaction caused by many factors, also can follow the doctor’s prescription oral anti-allergy drug treatment, such as ebastine tablets, also can be combined with vitamin C and calcium gluconate treatment, improve the permeability of blood vessels, relieve the symptoms of urticaria. Allergen testing must be perfected for recurrent urticaria. As excessive scratching and irritation will aggravate the itchy skin symptoms, so, no matter which disease in the treatment process should also pay attention to keep the skin clean, avoid excessive stimulation, avoid using hot water scalding. If there is redness and itching of the skin on the body, the occurrence of small bumps, it is recommended to go to the hospital in a timely manner, under the guidance of the doctor for symptomatic treatment.