Hi! My indoor cat has a dirty/scabby area/bump on the side of his face. He’s had chin acne before due to stress (he had to have a complicated surgery that really stressed him out) but it didn’t look exactly like this. That was an actual pimple with a white head and this looks more like black dirt. When I wiped it with a witch hazel wipe, some black specks came off and the wipe looked dirty. Could this be chin acne again?