Q. My cat has a big blister onbthtip other ear I put a needle inb it to try and give he some relief but now its bigger and darker
DAVID ELBEZE, DVM, MRCVS
A. If the whole ear is swollen and full of fluid it is a condition called "ear hematoma" cause by a primary ear infection followed by ear shaking.
The treatment is first of all ear drops to clear the ear infection (prescription ear drops) and then steroids for about a month to clear the hematoma.
You will need to go to the vet in order to receive the treatment.