Hi. Greetings. Dear Sir, I wish to enlighten you that hives could be due to many many reasons and may be tough for us to diagnose with the limited history you have provided. Urticaria may settle with few weeks treatment or need prolonged treatment for weeks to months with oral anti histamines to control your symptoms. It is mostly an allergic reaction to some unidentified internal or external stimulus. You can apply calamine lotion for improvement of symptoms. Meet a dermatologist for detailed evaluation and treatment. Hope this helps . warm regards, Dr Govind S Mittal.