I have a gray female cat that is ~5 years old that we raised from birth. She has black lips while all our other cats have pink. They are not spots but actually all black - very garth looking. They have always been like that but I can`t find any information about it and I've never seen it before. In fact, I never gave it a thought until someone mentioned how unusual it was.
I found nothing on google about it - anyone with an idea?