Could be Urticaria, put it into your search engine there are pictures,sounds like its something you are allergic to,think back to anything unusual you used on
your skin or ate any shower gel and
skin cream differant that your usual ,Alco hol has been known to cause Hives but so are a ton of other things including Penicillin and Pain Killers, certain foods and sweetners in sodas and coffee .Hives do come up as large wheals' and they can come up in the same place .