How come black spots appear on dog's tongues as they age?

When my dog was four I noticed a black spot on the back of her tongue. I already knew this happened to dogs but I want to know why.
Cade642
Asked May 04, 2014
The dog has been licking itself for years is #1.
But also, it just happens to dogs. Not all dog have this though.
Ken_selene
Answered Jul 20, 2014

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