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Hello. Thanks for the question.
This doesn't sound too serious. We can see pigmentation and de-pigmentation on the nose, gums and abdomen of dogs. This can happen secondary to irritations or just aging.
The one bad thing that could cause this is Melanoma- a type of cancer. It usually shows up as a black spot, but we can see some de-pigmented melanoma cells that show up white. I think it's a long shot here, but it's worth biopsying if it seems to be spreading quickly.
I hope this helps, let me know if you have any other questions.