Hi, I don’t know if anyone can make any suggestions as to what this is. My cat is an outdoors cat and we’ve seen him go in to other houses throughout the day, but always comes back to us at least once a day. Yesterday, he was fine. Then today he has come home and we’ve noticed this large bald spot on his head that was flat at first. He was very docile and seemed like he wanted to be alone, so he’s been sleeping under a bed for the whole day. We’ve looked again and now it appears swollen & red, and almost dented. Obviously we will be taking him to the vets ASAP but just wanted some thoughts on what people think it might be? I’m worried as he is 14 now and getting a bit slower.