Just fit back from vet. $57 later... Cat has a bad ear infection. Black stuff is a mixture of puss and blood from scratching. Got Tresaderm meds - drops for ear. Should clear up quickly. Been monthly visits with this cat since we got it. Sickly Rescue cat.
Our Kitten is 6 months old and one of his ears has some sort of black goo in it. I cleaned it out last night, but it seems tender and the goo is back this morning. I guess this means another vet visit. We've only had him 2 months, but he has been to the vet 3 times already. I'd be surprised...