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It could also be feline acne, what type of bowls are you using? are they on his chin?
My first thought was also feline acne. Toss out any plastic bowls or placemats and pick up some stainless steel bowls at the $ store. I bought about a dozen of them so after each use they go in my dishwasher.
To get rid of the acne, wipe his chin after each meal of wet food, particularly and ensure his bowls are washed and cleaned before each meal. It should clear up. Some folks use a diluted solution of hydrogen peroxide to wipe the chin area which you could also do but ensure it is diluted as hydrogen peroxide burns living tissue on both animals and people.
I was thinking the same thing. But what if it does not go away when you switch to steel bowls?
If the black spots look like they're part of the skin, just a freckle, they probably are. If there is any bumpiness associated with it, it's likely feline acne.