I just joined a new DBT group and was told that biting ones fingernails is considered self harm. Personally I think this is one of the most ridiculous things I've ever heard. I haven't cut in just over a month, and I don't normally bite my fingernails, but when I'm really anxious and overwhelmed I bite the nail on my right thumb. Just that one for some reason. So if I forget myself and do that in group I could be in trouble. Has anyone else heard of biting fingernails being considered self harm?