Hi David, what brand of flea treatment did you use? Unfortunately, many of the over the counter treatments have been known to cause health issues for cats, allergic reactions, and even neurological issues.
Check with your vet for a safe salve you could use on his tail.
Did the vet do a skin scraping to rule out any other skin parasites?
I hope he gets better soon!
"A Cat must have three different names:
An everyday family name; A particular name;
And the name but the Cat Himself Knows, and will never confess." T.S. Eliot
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