Dark Spot Under Nails shows ----

If you haven't banged or hurt your finger or toe recently, little dots of blood trapped under your nail could point to an infection in the lining of your heart or valves, called endocarditis. You can also get these blood specks when you have diabetes, and people with that condition are two to four times more likely to have heart disease and strokes.

this is only for your information, kindly take the advice of your doctor for medicines, exercises and so on.
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