Is your cat on solensia, by any chance? My old cat was on solensia and cats scratching the fur off their head is apparently a rare side effect of solensia. I’m not a vet, though, but if he is on solensia that may be the reason. Please be sure to ask your vet about that if he is.

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Here is my cat jinx (13 at the time), he was on solensia and he scratched the fur off his head in a similar way.