Re: Wart/grey mark?
Hello and welcome to HC!
Bruno is a lovely looking hamster.
There seems to be a slight thinning of fur on the other side of the nose as well which would indicate a bar rub but it is hard to tell from the photo.
If you can't find an environmental cause, i'd get him checked out by a hamster knowledgeable or exotics vet.
I also have a brown Syrian hamster whose fur has become a lot lighter. I wonder if he's going to change back to dark brown again.
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