What to put on a rabbit that has been stung by a wasp?

Yesterday was boiling hot and a wasp nest burst outside our rabbit cages the wasps were inside the cages and bit our three rabbits. Mine has a bite on her back near her neck. I was wondering if I can put something on it. This may sound stupid but an I use an antihistamine cream on it- if not what else can I use. I feel really bad for them :( thanks in advance x