Hi.. Welcome to HEALTHCARE MAGIC.. I have gone through your query and can understand your concerns.. As per your complain itchy hives over the body seems to be most probably due to allergic reaction and common allergens can be any food or medication, skin cosmetics, leather, latex, poison ivy etc.. It can also be due to mite infestation causing Scabies.. I would suggest you to consult an Allergist and get evaluated and a thorough clinical evaluation and investigations like allergic tests like Patch test, RAST test, food challenge test etc can help in diagnosis and treatment can be done accordingly. In case if allergy is confirmed as the cause allergist can advise you to take oral anti allergics as well as injectable steroids for relief.. You can also be instilled an Immunotherapy that will help in reducing the severity and frequency of allergic attack.. In case of scabies topical application of Prethermin lotion and oral Ivermectin can be helpful.. As of now you can take anti-allergics like Levocetrizine, Allegra to control the itching and swelling.. Do cool compresses.. Application of calamine lotion can help in soothing the skin.. Hope this information helps.. Thanks and regards.. Dr.Honey Nandwani Arora..