I worked in an allergist office for 10 years. Generally when a cause of hives can be determined...it is an allergic reaction to something ingested. Either eaten or a reaction to medicine. Unfortunately, 80% of hives are idiopathic...you will never know what caused them. They can be gone in the morning...come back in the afternoon. Scratching will just bring more hives.
Benadryl helps with the swelling and itching. Steriods work in the short term, but they are not a cure. There is no cure for hives.
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