Hello .thanks for your query..
I feel that you have something knows as Urticaria
It is common dermatological condition with frequent exacerbations and remissions.In most cases,a direct cause is not identified.However a combination of correct anti histaminic tablets for a few months help in reducing the severity and frequency of these hives
Start with the application of a soothing anti pruritic calamine
lotion to relieve the itch.In certain cases, a few bood tests are advised to rule out ant internal causation of the same.
hope this helps!take care...