K.K.
Thank you D. for raising this issue. My 3yrs old daughter is also in the habit of biting her skin around the nails. I was also looking for some advice. I personally feel that it happens because of stress. Sometimes kids feel they are not listened and parents always dominate them. She does it while she sits idle and she does it in bed when she dont feel like sleeping. My husband says its kind of stress buster. But i personally feel that this bad habit should be nip in the bud. I noticed it when i spend more time with her or the day she gets more attention from me, i dont see her biting her skin. When she is happy she does not do this. See if that can help you.