I noticed a bald spot on the back of my cat's neck aprox. three weeks ago on a saturday, about the size of a dime. I went to the vet the following monday, and by then it had yellow scabs and was slightly larger. The vet took skin and hair samples and cultures, and looked under a microscope for mites. He said no mites were present, and gave me an all-around topical medication. Since then the lesion has grown to aprox. six inches in diameter, and has bled, peeled, and changed color. I have taken the cat back three times, and been given two different topical medications, oral antibiotics, cortizone shot, a biopsy, and on the most recent visit, an ivermectin injection (which I have since heard is not approved for use in cats, and the vet did not get my permission before giving the injection). I have not yet received biopsy results, but could it have been notoedric mites the whole time? The cat seems a little better the past two days as far as the lesion goes, but is not acting normal by any means(listless and uninterested in any activities though he still eats and drinks) could he be having a reaction to the ivermectin? Are vets required to get permision befor giving that sort of injection? so far we have spent upwards of $250 and my husband is upset at the vet, since the vet said the culture only grow a fungus that was not ringworm. Any advice would be greatly appreciated. Sorry the post is so long, thanks in advance. Mishon