Hi Thanks for your query. You appear to be having a type of urticaria.Most of the time urticaria (hives)  is manifestation of an allergic reaction triggered by medications, foods, infections, certain physical agents like heat, cold, water, sun, other allergens and systemic illnesses.So the first thing in treatment of urticaria is diagnosis.  The diagnostic work-up includes blood tests, urine, stool to check for parasites, and x-rays of the chest, sinuses and teeth.  A prick or scratch test to test for airborn or food allergens is also in order. If nothing is found on the workup, then the relief is mostly symptomatic with antihistamines.