Nailah was microchipped when she was spayed May 14th. She now has a lump a little larger than a marble at the site. Is this normal? My vet says that sometimes they rarely develop fibrous tissue around the chips but I just wanted to see if anyone has had the same "reaction?" I know some of you breeders probably have a lot more experience with these microchips. Are there any known adverse reactions to these chips? My vet says he's never seen any which only makes me wonder.