It might be dietary (rather than a health problem). And it takes a while for a good food to begin working.

Questions...Is he neutered yet? And, was the mat in the tail on the top or underside?

Some cats, unneutered males primarily, can get "stud tail". Glands on the top of the tail, near the base, can make it EXTREMELY greasy.

Your plan of action.
another bath.....in Palmolive or other gentle dish washing soap. A lot of soap, a lot of scrubbing, and a lot of rinsing.

Brush, brush, brush......spreads the natural oils around. Use a wire slicker brush and shoot for once a day.


Feed a good food (may wish to discuss with a vet his particular needs)




OR

Just send him to me and I will do the grooming.