Cat Chat Feline Forum

My 18 year old female cat has always been an outdoor cat but because of her age and the weather I've started keeping her in however she has a scabby black growth on the outside of her ear and it keeps getting bigger. She did have ear mites but I have sorted that out.
I will be taking her to the vets asap but I was just curious if anyone knows what it could be. I do have pictures but I'm not sure how to post them.

Thanks