So the vet confirmed there are black spots on Cali's nose. The first, biggest one "popped" before we went there so it is just a scab now. She thinks they might be blackheads or perhaps injuries from scrapping with Diego. We are going to watch them for a couple of weeks and see if there is any change. In the meantime she asked about feliway. I told her my experience with the diffusers didn't go so well (when I put the refill in it started smoking!). She gave me the spray version of it so will be using that. So for now we are watching the pretty white nose to see if there is any change.