Hello, Hives on the body with severe itching seems to be most probably due to allergic reaction causing allergic dermatitis or contact dermatitis. It can be due to certain causes like any food or medication, skin cosmetics, soaps, detergents, leather, latex, while at times certain bed bugs can also be a cause. I would suggest you consult an allergist and get evaluated and a thorough clinical evaluation and investigations like allergic tests like Patch test, RAST test, food challenge test etcetera can help in diagnosis and treatment can be done accordingly. The tests will help in ruling out the exact cause of the allergen, and once you know the cause of the allergic reaction, you can avoid exposure to it to prevent allergy attack. The allergist can advise to oral anti allergics as well as injectable steroids for relief. As of now, you can take anti-allergic like Levocetrizine, Allegra to control the itching and swelling. Do cool compresses. Application of calamine lotion can help in soothing the skin. You can also be instilled immunotherapy that will help in reducing the severity and frequency of allergic attack. Hope I have answered your query. Let me know if I can assist you further. Regards, Dr. Honey Arora