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Hi there. My name is ***** ***** I'm happy to help you with your question.
Does the skin bleed where you rub off the black?
Does it seem to bother him when you're rubbing at it?
And the discoloration is all over?
Do you know if he has any health issues underlying?
Do you know if he's had his thyroid checked lately?
Thanks for the additional information. I really appreciate it.
Whenever a dog has a new skin condition, the first thing to do is to have your vet take a peek. They should do a thyroid screening (problems with the thyroid can often cause dermatological issues) and then possibly a skin scraping (where they take the edge of a scalpel blade and take off the first layer of skin and then look at it under a microscope to determine if there's a bacterial or yeast infection).
If the medical screening comes back clear, then odds are that this is just a normal aging change and nothing to be worried about. In the meantime, while you're waiting to see the vet, I'd stop trying to rub it off. Some skin infections can get "angry" meaning that the more you try to get rid of them, the more they spread....so holding off on rubbing the areas until the vet determines what kind of infection there is will give you the best outcome.
I hope this helps.