My Bella "bites" me on the back of the hand almost every night. I put that in quotes because she is actually grooming me, but she is ROUGH! She is actually nipping small bits of my skin off! My hand looks diseased. I have NO idea how to make her stop, as she doesn't seem to be doing it maliciously - it's just like she's grooming, but since she can't find fur on me, she nips my skin.
She never used to nip this hard, I'm not sure what caused her to start, and the first few times she did it, I would make a high pitched "ow!" like a squeak and she would stop, understanding that it hurt. Now she just plows through!
She will bite me if Kiwi makes too much noise in her cage while she is out for playtime too (she hates Kiwi)
Bella is a gentle sweet girl otherwise, I swear!