What you are describing is a cat that is not shedding appropriately. For some reason, in that area back there around the tail gets all matted up when it sheds instead of just falling out. The only solution is to remove the mats. If you leave them there, they will get worse, and sometimes nasty skin infections can start right under the mats.
If the kitty is real easy to deal with, you can remove these mats by brushing. If they can not be removed by brushing, they have to be cut out or clipped off. In my clinic, I often have to sedate cats like this and shave them to get rid of the mats. After the mats are removed, they can be prevented from coming back by brushing the cat on a regular basis to remove the loose hair.
Hope this helps, let me know if have further questions.
Dr. Lyle
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