Check the current active threads. There are at least two on hives, benedryl, cortisone, etc. You can also do a search of all BW threads for "hives" as well. You will find abundant info there.
This is a frequent affliction of Boxers because they are so tender. You need to systemically try and figure out what's causing the hives if they persist. You can find more detailed information with your search.
Also, please don't type in all upper case letters, it's more difficult to read and people consider it "Shouting." Thank you and good luck.