Hi I would really appreciate any advice.

My cat Missy came in the house Tuesday evening and we noticed she had a
small cut under her eye. We cleaned this up and thought she must have been
in a minor scrape with another cat. Last night she fell asleep at the foot
of our bed (fairly unusual) and she stayed there all night (unheard of).
She looked a little sad this morning as we left for work and her tail was
down as if she was upset. Whwn we got in from work tonight we noticed that
she was struggling to sit down. On inspection her tail has a lump about 2/3
from the base and it is causing her discomfort. She can't bare it being
touched. Do you think the tail could be broken, or maybe its dislocated. I
am not a very experienced cat owner so any advice would be appreciated,
before we take her vets in the morning.

Many thanks in advance!!

Damian