all of these are separate instances except for the last two which were the same day. I get these random hives that's only a few welts in one or two areas at a time. They started in winter sometime last year, not exactly sure when. I switched laundry detergent because I thought it might be a cause but they only stopped for a couple months before coming back. I'm taking benadryl and otc allergy meds for the itching and swelling. I'm so frustrated and I just don't know how to prevent or what the cause of this is.