I've noticed that a few of my cats have sores around their neck. Last night I seen Buttermilk had a spot behind his ear that has no fur, just a scab - I did put iodine on it. This morning, I could feel two sores or scabs on Monster on / around his neck. I just wonder what this is - if I should take them to the vet, or just treat it at home with neosporine. Any ideas?