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HI this is DRB and I would be happy to help you with this.....I have seen something similar to what you are describing on my patients before. Usually these are just areas of either comedones (black heads) or localized areas of hyper-pigmentation from licking that area. When dogs lick especially on their ventral abdomen (belly) they can get black spots in those areas.
It is also possible that it could be melanoma, but that is very doubtful, Usually when I see these they are either one of the two I have described above.
I hope this helps you. Sincerely, DRB
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Let me know if you need further assistance. I check my computer every night. DRB