My kitten is 4 months old. Ever since I've had him, he gets black "snot" on the edge of both his nostrils. He doesn't mind me gently scratching it out with my fingernail! I have to do this moreorless every day as it comes back. It's kind of crusty. He hasn't ever been outside (yet). Nor is he unwell
Does anyone have any idea what this might be?