Thanks for your help girls.
To be honest I've not noticed a pattern in her biting and I've never actually seen her do it, I just find the marks! :weepy: I also suspect she's nipping herself too!!!!
Thanks for the link Muggy, some food for thought there.
The funny thing is, she's very secretive about it and when I find a mark she gets very upset, pulls the affected arm away and fights me to stop me from looking at it!! Very confusing!
Oh well, if it gets worse there's always duct tape!!!:rotfl:
Thanks again girls.