Hi..
Thanks for the query..
As per your complain pain and rashes over the skin long with
severe itching seems to be most probably due to
allergic reaction and hair dye is a common agent that can cause itching and rashes..
But in case if the itching and rashes recurs it can be probably due to some other irritant other than hair dye and can be causes like soaps, detergents, poison ivy, latex, leather etc..
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..
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-allergics 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 an
Immunotherapy that will help in reducing the severity and frequency of allergic attack..
Hope this helps..
Thanks and regards..