From what you describe the itching seems to be related to ?allergic contact dermatitis.
Anti histaminic medicine and steroids help with the symptoms suggest that these symptoms are due to allergy.
Claritin (loratadine) is an antihistamine used to treat the symptoms of allergies.
You should continue with anti allergic medications and also apply anti itch lotion like calamine lotion.
Also you should undergo a blood test called AEC.(Absolute Eosinophil count)
This number rises in patients with allergic conditions.
A raised AEC usually confirms the diagnosis of allergy.However there are special test which are done to confim the exact allergen.(Comprehensive Allergy Panel)
You can consult your doctor or a dermatologist for further diagnosis and management.

Hi,
Apart from allergic contact dermatitis,other possible causes may include Neurodermatitis, brachoradial pruritus(This is a condition that affects nerves and/or nerve roots of arm and forearm).
So a clinical examination by a doctor should be considered in your case.
In the meantime you can continue to take Claritin and apply cool compresses on affected area.

I hope this helps.