You are suffering from urticaria which can be chronic at times. Common causes are food allergy, infection or drugs taken for some condition. It presents with itching resulting in formation of red rashes which we call hives or wheals. Although in most cases cause remains unknown in spite of a thorough search. This is called chronic idiopathic urticaria. This can be symptomatically treated with antihistamines so that you do not get any new hives. The treatment should be prolonged and acceptance of the condition is very important. There are better antihistamines other than cetirizine. Please call me or contact me through online consult option for further details and treatment.