An allergic body everywhere itching need to clarify the cause of the disease, active skin care or drug treatment. 1. Define the cause: allergies have many causes, may be related to diet, environment, season, drugs, infection and other factors, need to carefully recall any relevant special circumstances, if related to drugs, must remember and avoid taking such drugs, if accompanied by colds, fever, or abdominal pain, diarrhea and other discomforts, need to consult the doctor in time to find out whether there are infectious factors. 2. Skin care, after the appearance of obvious skin itching need to do a good job of skin care, it is best not to contact easily allergic substances, but also need to keep the skin clean, do not scratch excessively, so as not to lead to skin breakage aggravate the condition. 3. medication, after the allergic reaction can be used under the guidance of the doctor antihistamines, such as levocetirizine, fexofenadine tablets, etc., can relieve itching, but also with the use of glycerite lotion, mometasone furoate cream and other medications. Usually need to observe the skin recovery, if the rash does not go down and get worse, or accompanied by obvious chest tightness, breathlessness, dizziness, abdominal pain and other discomforts need to actively seek medical attention.