Hi..
Welcome to HEALTHCARE MAGIC..
I have gone through your query and can understand your concerns..
As per your complain itching and hives that gets relieved with
anti histamines seems to be due to
allergic reaction to some unknown allergens..
It can be due to a number of causes like certain foods and medications, detergents, skin cosmetics,latex,leather etc..
I would suggest you to consult an Allergist and get evaluated and he can advise you to get allergic testing done like
Patch test, Prick test, RAST test, food challenge test etc to rule out the symptoms and treat you accordingly..
You can be advised to take a long course of anti allergics like Levocetrizine, Allegra etc..
Apply steroid ointment over the rashes and hives..
Apply
Calamine lotion and do cool compresses.
You can be advised an
Immunotherapy to reduce the severity and frequency of allergic symptoms..
Hope this information helps..
Thanks and regards.
Dr.Honey Nandwani Arora.