What causes blue toenails?

Answer

According to WebMD, blue toenails are the discoloration of the lunula. Blue toenails can be a sign of several disorders. The disorders are trauma, lack of oxygen, fracture, and subungual hematoma. It is also stated that very cold temperatures can temporarily slow the flow of blood through the nail leading the nail to turn blue. The medical term for blue fingernails and toenails is called Cyanosis. If your nails remain blue it is best to have a medical checkup.
Q&A Related to "What causes blue toenails?"
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A dark toenail is just a dirty toenail.
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