Mojo got bit by a flea at the top of his ear once (i think was also the left one..hehehe) He had a bump for about 2 weeks, the vet said it was probably an allergic reaction to the flea bite. Mojo is on frontline so i donnou how that was possible (even though he was also due in the same week..
) My friend has experienced the same problem, i was told then that topical flea medication it might not work properly on the paws and top of the ears...so i put a few drops on the back of Mojo's ear, in a place i know he can;t lick