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It's the Dudley nose! Sometimes when they are young, it's black, then changes to brown, and sometimes even back to black later on. No scientific reason why yet, it just happens! The only thing that might worry me would be if Fizzy starts gaining weight rapidly, is lethargic, etc... sometimes it indicates hypothyroidism, but again no concrete research more of a "well-observed" coincidence that's been passed along between vets/techs.

Since everything else is normal, you can probably rule out vitiligo, lupus, squamous cell carcinoma, and contact dermatitis (plastic bowl syndrome).
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