How Can My Son S Recurring Urticaria Be Cured, As It Persists Despite Homeopathy, Allopathy, And Siddha Treatments?

Hi My son 11 years old and he is suffering from urticaria for past one year, we tried homeopathy, Alopatthy and siddha medicine but two days once getting swelling and itching. Taking okacet tablet to control this pls advice on this to cure from the same