Thank you for your question. There are several reasons for blue nailbeds. One possibility is poor oxygenation. This could be due to any number of reasons; lung problems, anemia, carbon monoxide, etc. A more benign possibility is Raynaud's phenomenon. This harmless condition causes coloration changes in the fingers with changes in temperature. I suppose the third possibility in today's teenage is blue nail polish - which I'm sure you've excluded. If you are at all concerned about her condition I would suggest a trip to the doctor for a examination.
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