I used the flea and tick drops on my cat after moving into a house infested with fleas. Now she is losing the fur around her neck in clumps. She hasn’t had any of the other symptoms and there is no redness or blistering. I can not afford the vet right now. I just lost my mother over the weekend to leukemia and I myself just won my battle with uterine cancer and have absolutely no money. Sigh I don’t know what to do except to watch her closely. If I would have looked online first.. smh I am so upset right now. I have used flea products on my cats before and never ever did I experience any of my cats getting sick or losing fur..