See a dermatologist: A couple of possibilities. A fungal or bacterial infection of the nail can cause discoloration and nail shedding. Pseudomonas nail infection gives a green-gray nail discoloration which can get loose and possibly fall. Also blood collections (subungual hematoma) can do the same, usually from trauma. This needs an evaluation and some lab tests and cultures. Please see your dermatologist right away.
Answered 5/3/2013
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