Black spot on dog's labia

Without looking and without experience with any female dogs, I'd guess it's melanine. Dog's skin tends to turn black where there is no fur to protect it from the sun. That's why their lips, noses, around their eyes, etc are almost breed universaly black. My boy had a bald spot on his tail, and it speckled black. Don't see why genitals wouldn't as well.
 
It's not a spot, but a small blister. It's a pimple, sometimes my dogs have it too. With a sterile needle and a disinfected skin surface, it can be carefully poked out and the contents squeezed out. Or if someone not skilled in medical treatments, they won't touch it. It disappears completely after a while (several weeks).

Must be checked, because it may not be pimple, but another type of skin lesion, which should not be pricked with a needle.

Fortunately, since it is outside in a visible place, the vet does not have to make embarrassing comments if you show him. 😅
 
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