DCat has gone mad in the past few days/weeks. First she scratched a bleeding wound into her neck and it took ages to heal because she wouldn't leave it alone. Then gradually even as the first wound improved, she's been scratching more and more little wounds on her shoulders. The past couple of days, she's gone totally scratch-mad and there are now several bleeding patches on her body. I hardly ever catch her scratching, it's something she seems to carefully do in private.
She is old, maybe 16-ish, has gone slightly deaf over the past year, but otherwise has been perfectly sprightly. She's regularly treated with Advantage and checked thoroughly for fleas.
Haven't changed her food brand or litter brand or routine in months. Having said that, I bought some Anicura gel for when she scratched the first wound, and it seemed to work a treat for getting her to stop scratching it so it could heal. So I guess that is a change in diet/routine (licking it up during grooming?).
Can't get a vet appointment for almost two weeks. After today's scratch-fest, I'm not sure there will be a cat left to attend the appointment by then.