What Does Black Streak Under Fingernails Indicate?

I have recently had some very small black streaks show up under fingernails. They seem to be dried blood that works its way to the tip and dissappear. Now I have a larger streak that started out white and has turned dark with dried blood. It does not appear to be working to the tip, and does not seem like it will go away. There is no pain except for the first when I noteced the white streak. Family history of skin cancer, high blood pressure, heart disease, diabetes, and kidney issues.



Thanks,



Don