I think DD1 combined DH and my habits.
I get very uncomfortable around strange people, and can remember being painfully shy as a child, and DH is a picker. His hands are always bleeding from him picking at his fingers, he does it when he is anxious.
DD1 has probably 10 tubes of flavored lip balm floating around the house, she'll ask for it herself sometimes, and I always put it on her before going to bed. I have never said anything about her lip picking, I figured if I ignored it then it would go away, but it just keeps getting worse. There is a tricky line there, sometimes she does it just sitting here at home when she isn't nervous, and other times I can tell she is uncomfortable. She just had a little holiday thing for her dance class, the entire time we were there she was picking at her lips, she didn't even stop to dance (and she loves to dance, loves her class) she just danced while picking her lips the entire time.
I understand if she needs something to make her feel better, but i also would like her not to make herself bleed... She is very slow to warm up, she just started talking to the woman who does storytime at the library, we've been going since she was 1.