If he has diabetes, he has a high sugar level in his urine making it more attractive for fungus to grow on - it's most likely aspergillus fungus, which is everywhere. It can cause health problems occasionally, so I'd advise you to clean his cage more often - his toilet area should ideally be cleaned daily.
Have you read the sticky thread about how to deal with diabetes?
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Emma
Hamster Central Moderator
Owned by Merry, Pippin, Lola & Shirley (roborovskis) Toby & Hazel (syrians)
Missing my angel Phoebe
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