Hi my cat is 12 years old. Has lost a bit of weight over the last 2 years.went to the vet last year as she’d gone to ground and was pooping funny and was given worming tablets and the vet mentioned failing that they could check for cancer. She did seem to improve. Anyway she doesn’t have many fleas and she’s an indoor cat.she is urinating outside the litter tray and throwing up occasionally. Anyway she has a lot of red sores on top of her head.Does anyone have any ideas? She seems ok at the moment. I have also brought some different cat food to try.