What Causes Toenails to Turn Black?

Hello, If you notice that your toenail has turned black, there’s no need to worry excessively—prompt treatment usually resolves the issue without complications. The cause of nail discoloration depends on the appearance and extent of the darkening: - If the nail appears bluish or purplish, it may indicate cold-induced blood stasis and impaired circulation of Qi and blood. - If discrete black spots are present, they may result from prior trauma causing subungual hemorrhage, or possibly a melanocytic nevus (pigmented mole). - If a relatively wide longitudinal black band appears, you should seek medical evaluation at a hospital promptly. I hope this information is helpful. Wishing you good health!