Your kitty looks like he is not having a good time right now, I hope he can get better soon. [sending lots of healing vibes]
We live in a very old house and there are allot of spiders in the basement and at times they come in the house. Yvonne don't think it was a spider bite because there was no swelling. It started out as a tiny little dark dot I noticed one day and it was slowly getting bigger, So I though just to be safe I would ask about it, It could just be from Angels claw that poked him in the nose, she fights with the other cats at times.
We also have a bad problem with static electricity in this house when it gets real cold out because the furnace dries the air out so bad. About a week ago I held out my hand to Cozmo and he came up to it and a big spark jumped from my finger to his nose so maybe the spot was a burn healing from that. I told the vet that and she said that could be all it is. I am to call her if it gets any worse looking.
It was a good thing I called about it and took him in, at least they found out he was having other problems and got him on a med before it got real bad. I forgot to say the vet thinks he has the start of a respiratory infection also, she said that after she asked if he had been sneezing, which I don't think he is but sometimes right after he wakes up from a long sleep he has a very deep wet cough that just started also, so I told her that and she listened to his chest and said something about it being loud in there, so the clavamox should help with the breathing and his sore little back end.
I have so much going on I am getting over loaded and can't think straight sometimes so I forget stuff when I get like this, my brain has all kind of different thoughts racing through it at one time, the fun of being bipolar I guess.