My orange cat gets it too... I always thought it was boogers.
I thought that at first but like, when he gets snotty, it's usually greenish. I was just worried since it was all black looking. D:
The difference is, when the snot builds up, you can see the color (or it acquires color, not sure which), but when it's thin the way it's supposed to be, it just collects dirt (that's one of its jobs) and all you see is the dried dirt.
That article isn't even relevant. The OP posted asking about crusty buildup around her cat's nostrils and the article you linked is about freckles/actual spots and pigment on the skin.
For what it's worth, my orange cats get them every now and again and they've never had any issues. My vet was unconcerned and said it's likely just dirt and buildup.
Ah, alright. I usually just clean it off but I wanted to make sure it wasn't something leading up to something else that was worse, if that makes sense.
That's almost certainly what it is. (Ex-vet tech.)
Also, the cat that gets them most here is also an orangeycat.
My cat got those right after we moved across the country into an entirely different climate. They disappeared after a month. I figured she just had to get used to the climate/new apartment.
My cream cat gets that when he's using a dusty litter such as clay.
Hm, maybe I'll try switching litters then. We've been using tidy cat's 'small spaces' litter since we live in an efficiency but it is that clay stuff.
I originally tried the newspaper based ones (yesterdays' news, etc) and he didn't seem to enjoy it; though, I saw one made out of corn? yesterday so maybe I'll pick that up.
My cats get a bit of that, and vets have told me it is nothing to worry about, it is just normal discharge.
My orange tabby gets something very similar to that, but under her chin. It comes off in flakes if I rub it or clean her, but it always comes back. Similarly to what other posters have said, it's a combo of saliva (since she is prone to drooling) and the dirt it traps, and is completely harmless.
Dirty kitty snot! My boy has had it since he was a kitten; I've always just brushed/picked it off for him. Sounds like it's pretty common, hey? XD