Welcome to HCM. Recurrent hives with itching is usually due to some allergic episodes. There is always some triggering factor(allergen) for it. You have to be watchful for triggering factor. Allergy test will be helpful to find out the allergy. Take levocetrizine,fexofenedine during episodes. Sometime steroid is also required to subside the severe allergic reaction. Apply calamine/aloevera lotion to get cool effect. Consult dermatologist for further guidance and medical management.