What's your diagnosis and what could be the underlying condition? I'll post the correct answer in a few days!
Correct answer: Onychotillomania. Based on the jagged edges, these nails have not been bitten but torn off. Onychotillomania is a compulsive neurosis in which patients constantly pick at the nails and try to tear them off. It's most commonly associated with depressive neurosis, but can also be seen in hypochondiasis. It can be treated with antipsychotics.